Refactoring. Use QString default constructor instead of empty string.

--HG--
branch : develop

src/app/tape/tmainwindow.cpp

@@ -385,7 +385,7 @@ void TMainWindow::FileNew()
         mIsReadOnly = m->IsReadOnly();
         UpdatePadlock(mIsReadOnly);
 
-        SetCurrentFile("");
+        SetCurrentFile(QString());
         MeasurementsWasSaved(false);
 
         InitWindow();
@@ -449,7 +449,7 @@ void TMainWindow::OpenTemplate()
 
     if (m != nullptr)
     {// The file was opened.
-        SetCurrentFile(""); // Force user to to save new file
+        SetCurrentFile(QString()); // Force user to to save new file
         lock.reset();// remove lock from template
     }
 }
@@ -1134,15 +1134,15 @@ void TMainWindow::Remove()
         ui->actionExportToCSV->setEnabled(false); 
 
         ui->lineEditName->blockSignals(true);
-        ui->lineEditName->setText("");
+        ui->lineEditName->setText(QString());
         ui->lineEditName->blockSignals(false);
 
         ui->plainTextEditDescription->blockSignals(true);
-        ui->plainTextEditDescription->setPlainText("");
+        ui->plainTextEditDescription->setPlainText(QString());
         ui->plainTextEditDescription->blockSignals(false);
 
         ui->lineEditFullName->blockSignals(true);
-        ui->lineEditFullName->setText("");
+        ui->lineEditFullName->setText(QString());
         ui->lineEditFullName->blockSignals(false);
 
         if (mType == MeasurementsType::Multisize)
@@ -1152,7 +1152,7 @@ void TMainWindow::Remove()
             ui->doubleSpinBoxInSizes->blockSignals(true);
             ui->doubleSpinBoxInHeights->blockSignals(true);
 
-            ui->labelCalculatedValue->setText("");
+            ui->labelCalculatedValue->setText(QString());
             ui->doubleSpinBoxBaseValue->setValue(0);
             ui->doubleSpinBoxInSizes->setValue(0);
             ui->doubleSpinBoxInHeights->setValue(0);
@@ -1165,11 +1165,11 @@ void TMainWindow::Remove()
         else
         {
             ui->labelCalculatedValue->blockSignals(true);
-            ui->labelCalculatedValue->setText("");
+            ui->labelCalculatedValue->setText(QString());
             ui->labelCalculatedValue->blockSignals(false);
 
             ui->plainTextEditFormula->blockSignals(true);
-            ui->plainTextEditFormula->setPlainText("");
+            ui->plainTextEditFormula->setPlainText(QString());
             ui->plainTextEditFormula->blockSignals(false);
         }
     }
@@ -2994,7 +2994,7 @@ void TMainWindow::CreateWindowMenu(QMenu *menu)
         const int index = title.lastIndexOf("[*]");
         if (index != -1)
         {
-            window->isWindowModified() ? title.replace(index, 3, "*") : title.replace(index, 3, "");
+            window->isWindowModified() ? title.replace(index, 3, "*") : title.replace(index, 3, QString());
         }
 
         QAction *action = menu->addAction(title, this, SLOT(ShowWindow()));

src/app/valentina/core/vtooloptionspropertybrowser.cpp

@@ -496,7 +496,7 @@ void VToolOptionsPropertyBrowser::itemClicked(QGraphicsItem *item)
     currentItem = item;
     if (currentItem == nullptr)
     {
-        formView->setTitle("");
+        formView->setTitle(QString());
         return;
     }
 

src/app/valentina/dialogs/dialoghistory.cpp

@@ -498,7 +498,7 @@ void DialogHistory::RetranslateUi()
 
     QTableWidgetItem *item = ui->tableWidget->item(cursorRow, 0);
     SCASSERT(item != nullptr)
-    item->setIcon(QIcon(""));
+    item->setIcon(QIcon(QString()));
 
     cursorRow = currentRow;
     cellClicked(cursorRow, 0);

src/app/valentina/mainwindow.cpp

@@ -202,7 +202,7 @@ MainWindow::MainWindow(QWidget *parent)
 
     ReadSettings();
 
-    setCurrentFile("");
+    setCurrentFile(QString());
     WindowsLocale();
 
     connect(ui->listWidget, &QListWidget::currentRowChanged, this, &MainWindow::ShowPaper);
@@ -324,7 +324,7 @@ void MainWindow::AddPP(const QString &PPName)
     QApplication::postEvent(this, new FitBestCurrentEvent());
 
     ui->actionNewDraw->setEnabled(true);
-    m_statusLabel->setText("");
+    m_statusLabel->setText(QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -2170,7 +2170,7 @@ void MainWindow::CancelTool()
             {
                 pointer->setChecked(false);
             }
-            m_statusLabel->setText("");
+            m_statusLabel->setText(QString());
 
             // Crash: using CRTL+Z while using line tool.
             // related bug report:
@@ -2381,7 +2381,7 @@ void  MainWindow::ArrowTool(bool checked)
         ui->view->viewport()->unsetCursor();
         ui->view->viewport()->setCursor(QCursor(Qt::ArrowCursor));
         ui->view->setCurrentCursorShape(); // Hack to fix problem with a cursor
-        m_statusLabel->setText("");
+        m_statusLabel->setText(QString());
         ui->view->setShowToolOptions(true);
         qCDebug(vMainWindow, "Enabled arrow tool.");
     }
@@ -2575,7 +2575,7 @@ void MainWindow::ActionDetails(bool checked)
         ui->dockWidgetGroups->setVisible(isDockGroupsVisible);
         ui->dockWidgetGroups->setToolTip(tr("Show which details will go in layout"));
 
-        m_statusLabel->setText("");
+        m_statusLabel->setText(QString());
     }
     else
     {
@@ -2676,7 +2676,7 @@ void MainWindow::ActionLayout(bool checked)
         SetEnableWidgets(true);
         ui->toolBox->setCurrentIndex(ui->toolBox->indexOf(ui->layoutPage));
 
-        mouseCoordinate->setText("");
+        mouseCoordinate->setText(QString());
 
         if (qApp->patternType() == MeasurementsType::Multisize)
         {
@@ -2700,7 +2700,7 @@ void MainWindow::ActionLayout(bool checked)
             ui->toolButtonLayoutSettings->click();
         }
 
-        m_statusLabel->setText("");
+        m_statusLabel->setText(QString());
     }
     else
     {
@@ -5442,7 +5442,7 @@ QString MainWindow::GetMeasurementFileName()
 {
     if(doc->MPath().isEmpty())
     {
-        return "";
+        return QString();
     }
     else
     {

src/app/valentina/mainwindowsnogui.cpp

@@ -1229,7 +1229,7 @@ void MainWindowsNoGUI::RestoreTextAfterDXF(const QString &placeholder,
                     if(QGraphicsSimpleTextItem *textItem = qgraphicsitem_cast<QGraphicsSimpleTextItem *>(item))
                     {
                         QString text = textItem->text();
-                        text.replace(placeholder, "");
+                        text.replace(placeholder, QString());
                         textItem->setText(text);
                     }
                 }
@@ -1412,7 +1412,7 @@ void MainWindowsNoGUI::SetPrinterSettings(QPrinter *printer, const PrintType &pr
             break;
         }
         case PrintType::PrintNative:
-            printer->setOutputFileName("");//Disable printing to file if was enabled.
+            printer->setOutputFileName(QString());//Disable printing to file if was enabled.
             printer->setOutputFormat(QPrinter::NativeFormat);
             break;
         case PrintType::PrintPreview: /*do nothing*/

src/app/valentina/xml/vpattern.cpp

@@ -383,7 +383,7 @@ quint32 VPattern::SPointActiveDraw()
             const QDomElement domElement = domNode.toElement();
             if (domElement.isNull() == false)
             {
-                if (domElement.tagName() == TagPoint && domElement.attribute(AttrType, "") == VToolBasePoint::ToolType)
+                if (domElement.tagName() == TagPoint && domElement.attribute(AttrType, QString()) == VToolBasePoint::ToolType)
                 {
                     return GetParametrId(domElement);
                 }
@@ -797,7 +797,7 @@ void VPattern::ParseDrawMode(const QDomNode &node, const Document &parse, const
             {
                 case 0: // TagPoint
                     qCDebug(vXML, "Tag point.");
-                    ParsePointElement(scene, domElement, parse, domElement.attribute(AttrType, ""));
+                    ParsePointElement(scene, domElement, parse, domElement.attribute(AttrType, QString()));
                     break;
                 case 1: // TagLine
                     qCDebug(vXML, "Tag line.");
@@ -805,23 +805,23 @@ void VPattern::ParseDrawMode(const QDomNode &node, const Document &parse, const
                     break;
                 case 2: // TagSpline
                     qCDebug(vXML, "Tag spline.");
-                    ParseSplineElement(scene, domElement, parse, domElement.attribute(AttrType, ""));
+                    ParseSplineElement(scene, domElement, parse, domElement.attribute(AttrType, QString()));
                     break;
                 case 3: // TagArc
                     qCDebug(vXML, "Tag arc.");
-                    ParseArcElement(scene, domElement, parse, domElement.attribute(AttrType, ""));
+                    ParseArcElement(scene, domElement, parse, domElement.attribute(AttrType, QString()));
                     break;
                 case 4: // TagTools
                     qCDebug(vXML, "Tag tools.");
-                    ParseToolsElement(scene, domElement, parse, domElement.attribute(AttrType, ""));
+                    ParseToolsElement(scene, domElement, parse, domElement.attribute(AttrType, QString()));
                     break;
                 case 5: // TagOperation
                     qCDebug(vXML, "Tag operation.");
-                    ParseOperationElement(scene, domElement, parse, domElement.attribute(AttrType, ""));
+                    ParseOperationElement(scene, domElement, parse, domElement.attribute(AttrType, QString()));
                     break;
                 case 6: // TagElArc
                     qCDebug(vXML, "Tag elliptical arc.");
-                    ParseEllipticalArcElement(scene, domElement, parse, domElement.attribute(AttrType, ""));
+                    ParseEllipticalArcElement(scene, domElement, parse, domElement.attribute(AttrType, QString()));
                     break;
                 case 7: // TagPath
                     qCDebug(vXML, "Tag path.");
@@ -3140,7 +3140,7 @@ void VPattern::ParseToolRotation(VMainGraphicsScene *scene, QDomElement &domElem
         initData.origin = GetParametrUInt(domElement, AttrCenter, NULL_ID_STR);
         initData.angle = GetParametrString(domElement, AttrAngle, "10");
         const QString a = initData.angle;//need for saving fixed formula;
-        initData.suffix = GetParametrString(domElement, AttrSuffix, "");
+        initData.suffix = GetParametrString(domElement, AttrSuffix, QString());
 
         VAbstractOperation::ExtractData(domElement, initData);
 
@@ -3185,7 +3185,7 @@ void VPattern::ParseToolFlippingByLine(VMainGraphicsScene *scene, QDomElement &d
         ToolsCommonAttributes(domElement, initData.id);
         initData.firstLinePointId = GetParametrUInt(domElement, AttrP1Line, NULL_ID_STR);
         initData.secondLinePointId = GetParametrUInt(domElement, AttrP2Line, NULL_ID_STR);
-        initData.suffix = GetParametrString(domElement, AttrSuffix, "");
+        initData.suffix = GetParametrString(domElement, AttrSuffix, QString());
 
         VAbstractOperation::ExtractData(domElement, initData);
 
@@ -3217,7 +3217,7 @@ void VPattern::ParseToolFlippingByAxis(VMainGraphicsScene *scene, QDomElement &d
         ToolsCommonAttributes(domElement, initData.id);
         initData.originPointId = GetParametrUInt(domElement, AttrCenter, NULL_ID_STR);
         initData.axisType = static_cast<AxisType>(GetParametrUInt(domElement, AttrAxisType, "1"));
-        initData.suffix = GetParametrString(domElement, AttrSuffix, "");
+        initData.suffix = GetParametrString(domElement, AttrSuffix, QString());
 
         VAbstractOperation::ExtractData(domElement, initData);
 
@@ -3253,7 +3253,7 @@ void VPattern::ParseToolMove(VMainGraphicsScene *scene, QDomElement &domElement,
         const QString r = initData.formulaRotationAngle;//need for saving fixed formula;
         initData.formulaLength = GetParametrString(domElement, AttrLength, "0");
         const QString len = initData.formulaLength;//need for saving fixed formula;
-        initData.suffix = GetParametrString(domElement, AttrSuffix, "");
+        initData.suffix = GetParametrString(domElement, AttrSuffix, QString());
         initData.rotationOrigin = GetParametrUInt(domElement, AttrCenter, NULL_ID_STR);
 
         VAbstractOperation::ExtractData(domElement, initData);
@@ -3316,7 +3316,7 @@ QDomElement VPattern::MakeEmptyIncrement(const QString &name)
     QDomElement element = createElement(TagIncrement);
     SetAttribute(element, AttrName, name);
     SetAttribute(element, AttrFormula, QString("0"));
-    SetAttribute(element, AttrDescription, QString(""));
+    SetAttribute(element, AttrDescription, QString(QString()));
     return element;
 }
 
@@ -3764,7 +3764,7 @@ void VPattern::ParseIncrementsElement(const QDomNode &node, const Document &pars
             {
                 if (domElement.tagName() == TagIncrement)
                 {
-                    const QString name = GetParametrString(domElement, AttrName, "");
+                    const QString name = GetParametrString(domElement, AttrName, QString());
                     const QString desc = GetParametrEmptyString(domElement, AttrDescription);
                     const QString formula = GetParametrString(domElement, AttrFormula, "0");
                     bool ok = false;

src/libs/ifc/xml/vpatternconverter.cpp

@@ -2134,7 +2134,7 @@ void VPatternConverter::TagDetailToV0_4_0()
                                 tagNode.setAttribute(*strMy, element.attribute(*strMy, "0"));
                             }
 
-                            tagNode.setAttribute(*strType, element.attribute(*strType, ""));
+                            tagNode.setAttribute(*strType, element.attribute(*strType, QString()));
 
                             tagNodes.appendChild(tagNode);
 
@@ -2187,7 +2187,7 @@ QDomElement VPatternConverter::GetUnionDetailNodesV0_4_0(const QDomElement &deta
                     tagNode.setAttribute(*strReverse, node.attribute(*strReverse, "0"));
                 }
 
-                tagNode.setAttribute(*strType, node.attribute(*strType, ""));
+                tagNode.setAttribute(*strType, node.attribute(*strType, QString()));
 
                 tagNodes.appendChild(tagNode);
             }
@@ -2395,7 +2395,7 @@ void VPatternConverter::PortPieceLabelstoV0_6_0()
         const int count = nodeListMCP.count();
         try
         {
-            if (not GetParametrString(dataTag, *strLetter, "").isEmpty())
+            if (not GetParametrString(dataTag, *strLetter, QString()).isEmpty())
             {
                 AddLabelTemplateLineV0_6_0(dataTag, "%pLetter%", true, false, Qt::AlignHCenter, 6);
             }

src/libs/ifc/xml/vvitconverter.cpp

@@ -242,8 +242,8 @@ QDomElement VVITConverter::AddMV0_3_0(const QString &name, qreal value)
 
     SetAttribute(element, QStringLiteral("name"), name);
     SetAttribute(element, QStringLiteral("value"), QString().setNum(value));
-    SetAttribute(element, QStringLiteral("description"), QString(""));
+    SetAttribute(element, QStringLiteral("description"), QString());
-    SetAttribute(element, QStringLiteral("full_name"), QString(""));
+    SetAttribute(element, QStringLiteral("full_name"), QString());
 
     return element;
 }

src/libs/ifc/xml/vvstconverter.cpp

@@ -264,8 +264,8 @@ QDomElement VVSTConverter::AddMV0_4_0(const QString &name, qreal value, qreal si
     SetAttribute(element, QStringLiteral("base"), QString().setNum(value));
     SetAttribute(element, QStringLiteral("size_increase"), QString().setNum(sizeIncrease));
     SetAttribute(element, QStringLiteral("height_increase"), QString().setNum(heightIncrease));
-    SetAttribute(element, QStringLiteral("description"), QString(""));
+    SetAttribute(element, QStringLiteral("description"),QString());
-    SetAttribute(element, QStringLiteral("full_name"), QString(""));
+    SetAttribute(element, QStringLiteral("full_name"), QString());
 
     return element;
 }

src/libs/qmuparser/qmuformulabase.cpp

@@ -76,10 +76,10 @@ void QmuFormulaBase::InitCharSets()
 
     // Defining identifier character sets
     const QString nameChars = QString() + sign0 + sign1 + sign2 + sign3 + sign4 + sign5 + sign6 + sign7 + sign8 +
-            sign9 + QLatin1String("\\_@#'") + symbols.join("");
+            sign9 + QLatin1String("\\_@#'") + symbols.join(QString());
     DefineNameChars(nameChars);
 
-    const QString oprtChars = symbols.join("") + positiveSign + negativeSign + QLatin1String("*^/?<>=!$%&|~'_");
+    const QString oprtChars = symbols.join(QString()) + positiveSign + negativeSign + QLatin1String("*^/?<>=!$%&|~'_");
     DefineOprtChars(oprtChars);
 
     const QString infixOprtChars = QString() + positiveSign + negativeSign + QLatin1String("*^/?<>=!$%&|~'_");

src/libs/qmuparser/qmuparsertest.cpp

@@ -721,7 +721,7 @@ int QmuParserTester::TestInfixOprt()
     iStat += EqnTest ( "(-3)^2", 9, true );
     iStat += EqnTest ( "-(-2^2)", 4, true );
     iStat += EqnTest ( "3+-3^2", -6, true );
-    // The following assumes use of sqr as postfix operator ("") together
+    // The following assumes use of sqr as postfix operator (QString()) together
     // with a sign operator of low priority:
     iStat += EqnTest ( "-2'", -4, true );
     iStat += EqnTest ( "-(1+1)'", -4, true );

src/libs/vdxf/vdxfengine.cpp

@@ -373,7 +373,7 @@ void VDxfEngine::drawTextItem(const QPointF & p, const QTextItem & textItem)
 
     if (foundEndOfString)
     {
-        t.replace(endStringPlaceholder, "");
+        t.replace(endStringPlaceholder, QString());
     }
 
     textBuffer->text += t.toStdString();

src/libs/vformat/vmeasurements.cpp

@@ -371,7 +371,7 @@ int VMeasurements::BaseHeight() const
 //---------------------------------------------------------------------------------------------------------------------
 QString VMeasurements::Notes() const
 {
-    return UniqueTagText(TagNotes, "");
+    return UniqueTagText(TagNotes, QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -386,7 +386,7 @@ void VMeasurements::SetNotes(const QString &text)
 //---------------------------------------------------------------------------------------------------------------------
 QString VMeasurements::Customer() const
 {
-    return UniqueTagText(TagCustomer, "");
+    return UniqueTagText(TagCustomer, QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -446,7 +446,7 @@ void VMeasurements::SetPMSystem(const QString &system)
 //---------------------------------------------------------------------------------------------------------------------
 QString VMeasurements::Email() const
 {
-    return UniqueTagText(TagEmail, "");
+    return UniqueTagText(TagEmail, QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vlayout/vtextmanager.cpp

@@ -126,15 +126,15 @@ QMap<QString, QString> PreparePlaceholders(const VAbstractPattern *doc)
     }
 
     // Piece tags
-    placeholders.insert(pl_pLetter, "");
+    placeholders.insert(pl_pLetter, QString());
-    placeholders.insert(pl_pAnnotation, "");
+    placeholders.insert(pl_pAnnotation, QString());
-    placeholders.insert(pl_pOrientation, "");
+    placeholders.insert(pl_pOrientation, QString());
-    placeholders.insert(pl_pRotation, "");
+    placeholders.insert(pl_pRotation, QString());
-    placeholders.insert(pl_pTilt, "");
+    placeholders.insert(pl_pTilt, QString());
-    placeholders.insert(pl_pFoldPosition, "");
+    placeholders.insert(pl_pFoldPosition, QString());
-    placeholders.insert(pl_pName, "");
+    placeholders.insert(pl_pName, QString());
-    placeholders.insert(pl_pQuantity, "");
+    placeholders.insert(pl_pQuantity, QString());
-    placeholders.insert(pl_wOnFold, "");
+    placeholders.insert(pl_wOnFold, QString());
     placeholders.insert(pl_mFabric, QObject::tr("Fabric"));
     placeholders.insert(pl_mLining, QObject::tr("Lining"));
     placeholders.insert(pl_mInterfacing, QObject::tr("Interfacing"));

src/libs/vmisc/qxtcsvmodel.cpp

@@ -606,7 +606,7 @@ bool QxtCsvModel::toCSV(QIODevice* dest, QString &error, bool withHeader, QChar
     }
     if (withHeader)
     {
-        data = "";
+        data = QString();
         for (col = 0; col < cols; ++col)
         {
             if (col > 0)
@@ -620,7 +620,7 @@ bool QxtCsvModel::toCSV(QIODevice* dest, QString &error, bool withHeader, QChar
     for (row = 0; row < rows; ++row)
     {
         const QStringList& rowData = d_ptr.csvData[row];
-        data = "";
+        data = QString();
         for (col = 0; col < cols; ++col)
         {
             if (col > 0)

src/libs/vpatterndb/vtranslatevars.cpp

@@ -1005,7 +1005,7 @@ QString VTranslateVars::FormulaToUser(const QString &formula, bool osSeparator)
             QString dStr = loc.toString(d);// Number string in user locale
             if (loc.groupSeparator().isSpace())
             {
-                dStr.replace(loc.groupSeparator(), "");
+                dStr.replace(loc.groupSeparator(), QString());
             }
             newFormula.replace(nKeys.at(i), nValues.at(i).length(), dStr);
             const int bias = nValues.at(i).length() - dStr.length();

src/libs/vpropertyexplorer/plugins/vlinetypeproperty.cpp

@@ -89,7 +89,7 @@ QWidget *VPE::VLineTypeProperty::createEditor(QWidget *parent, const QStyleOptio
     QMap<QString, QIcon>::const_iterator i = styles.constBegin();
     while (i != styles.constEnd())
     {
-        tmpEditor->addItem(i.value(), "", QVariant(i.key()));
+        tmpEditor->addItem(i.value(), QString(), QVariant(i.key()));
         ++i;
     }
 

src/libs/vtools/dialogs/support/dialogeditlabel.cpp

@@ -512,20 +512,20 @@ void DialogEditLabel::InitPlaceholders()
     }
 
     // Piece tags
-    m_placeholders.insert(pl_pLetter, qMakePair(tr("Piece letter"), QString("")));
+    m_placeholders.insert(pl_pLetter, qMakePair(tr("Piece letter"), QString(QString())));
-    m_placeholders.insert(pl_pAnnotation, qMakePair(tr("Piece annotation"), QString("")));
+    m_placeholders.insert(pl_pAnnotation, qMakePair(tr("Piece annotation"), QString(QString())));
-    m_placeholders.insert(pl_pOrientation, qMakePair(tr("Piece orientation"), QString("")));
+    m_placeholders.insert(pl_pOrientation, qMakePair(tr("Piece orientation"), QString(QString())));
-    m_placeholders.insert(pl_pRotation, qMakePair(tr("Piece rotation"), QString("")));
+    m_placeholders.insert(pl_pRotation, qMakePair(tr("Piece rotation"), QString(QString())));
-    m_placeholders.insert(pl_pTilt, qMakePair(tr("Piece tilt"), QString("")));
+    m_placeholders.insert(pl_pTilt, qMakePair(tr("Piece tilt"), QString(QString())));
-    m_placeholders.insert(pl_pFoldPosition, qMakePair(tr("Piece fold position"), QString("")));
+    m_placeholders.insert(pl_pFoldPosition, qMakePair(tr("Piece fold position"), QString(QString())));
-    m_placeholders.insert(pl_pName, qMakePair(tr("Piece name"), QString("")));
+    m_placeholders.insert(pl_pName, qMakePair(tr("Piece name"), QString(QString())));
-    m_placeholders.insert(pl_pQuantity, qMakePair(tr("Quantity"), QString("")));
+    m_placeholders.insert(pl_pQuantity, qMakePair(tr("Quantity"), QString(QString())));
     m_placeholders.insert(pl_mFabric, qMakePair(tr("Material: Fabric"), tr("Fabric")));
     m_placeholders.insert(pl_mLining, qMakePair(tr("Material: Lining"), tr("Lining")));
     m_placeholders.insert(pl_mInterfacing, qMakePair(tr("Material: Interfacing"), tr("Interfacing")));
     m_placeholders.insert(pl_mInterlining, qMakePair(tr("Material: Interlining"), tr("Interlining")));
     m_placeholders.insert(pl_wCut, qMakePair(tr("Word: Cut"), tr("Cut")));
-    m_placeholders.insert(pl_wOnFold, qMakePair(tr("Word: on fold"), QString("")));// By default should be empty
+    m_placeholders.insert(pl_wOnFold, qMakePair(tr("Word: on fold"), QString(QString())));// By default should be empty
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vtools/dialogs/support/dialogeditwrongformula.cpp

@@ -162,7 +162,7 @@ void DialogEditWrongFormula::ValChanged(int row)
 {
     if (ui->tableWidget->rowCount() == 0)
     {
-        ui->labelDescription->setText("");
+        ui->labelDescription->setText(QString());
         return;
     }
     QTableWidgetItem *item = ui->tableWidget->item( row, ColumnName );
@@ -508,7 +508,7 @@ void DialogEditWrongFormula::ShowVariable(const QMap<key, val> &var)
     ui->tableWidget->clearContents();
     ui->tableWidget->setRowCount(0);
     ui->tableWidget->setColumnHidden(ColumnFullName, true);
-    ui->labelDescription->setText("");
+    ui->labelDescription->setText(QString());
 
     QMapIterator<key, val> iMap(var);
     while (iMap.hasNext())
@@ -542,7 +542,7 @@ void DialogEditWrongFormula::ShowMeasurements(const QMap<QString, QSharedPointer
     ui->tableWidget->clearContents();
     ui->tableWidget->setRowCount(0);
     ui->tableWidget->setColumnHidden(ColumnFullName, false);
-    ui->labelDescription->setText("");
+    ui->labelDescription->setText(QString());
 
     QMapIterator<QString, QSharedPointer<VMeasurement>> iMap(var);
     while (iMap.hasNext())
@@ -590,7 +590,7 @@ void DialogEditWrongFormula::ShowFunctions()
     ui->tableWidget->clearContents();
     ui->tableWidget->setRowCount(0);
     ui->tableWidget->setColumnHidden(ColumnFullName, true);
-    ui->labelDescription->setText("");
+    ui->labelDescription->setText(QString());
 
     const QMap<QString, qmu::QmuTranslation> functions = qApp->TrVars()->GetFunctions();
     QMap<QString, qmu::QmuTranslation>::const_iterator i = functions.constBegin();

src/libs/vtools/dialogs/tools/dialogalongline.cpp

@@ -184,7 +184,7 @@ void DialogAlongLine::ChosenObject(quint32 id, const SceneObject &type)
                     }
                     break;
                 case 1:
-                    if (SetObject(id, ui->comboBoxSecondPoint, ""))
+                    if (SetObject(id, ui->comboBoxSecondPoint, QString()))
                     {
                         if (flagError)
                         {

src/libs/vtools/dialogs/tools/dialogarc.cpp

@@ -256,7 +256,7 @@ void DialogArc::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Point)
         {
-            if (SetObject(id, ui->comboBoxBasePoint, ""))
+            if (SetObject(id, ui->comboBoxBasePoint, QString()))
             {
                 vis->VisualMode(id);
                 prepare = true;

src/libs/vtools/dialogs/tools/dialogarcwithlength.cpp

@@ -235,7 +235,7 @@ void DialogArcWithLength::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Point)
         {
-            if (SetObject(id, ui->comboBoxCenter, ""))
+            if (SetObject(id, ui->comboBoxCenter, QString()))
             {
                 vis->VisualMode(id);
                 prepare = true;

src/libs/vtools/dialogs/tools/dialogbisector.cpp

@@ -199,7 +199,7 @@ void DialogBisector::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (set.size() == 3)
                     {
-                        if (SetObject(id, ui->comboBoxThirdPoint, ""))
+                        if (SetObject(id, ui->comboBoxThirdPoint, QString()))
                         {
                             line->setObject3Id(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogcubicbezier.cpp

@@ -153,7 +153,7 @@ void DialogCubicBezier::ChosenObject(quint32 id, const SceneObject &type)
                 case 3:
                     if (getCurrentObjectId(ui->comboBoxP1) != id)
                     {
-                        if (SetObject(id, ui->comboBoxP4, ""))
+                        if (SetObject(id, ui->comboBoxP4, QString()))
                         {
                             ++number;
 

src/libs/vtools/dialogs/tools/dialogcubicbezierpath.cpp

@@ -165,7 +165,7 @@ void DialogCubicBezierPath::ShowDialog(bool click)
         {
             if (size - VCubicBezierPath::SubSplPointsCount(path.CountSubSpl()) == 0)
             {// Accept only if all subpaths are completed
-                emit ToolTip("");
+                emit ToolTip(QString());
 
                 if (not data->IsUnique(path.name()))
                 {

src/libs/vtools/dialogs/tools/dialogcurveintersectaxis.cpp

@@ -216,7 +216,7 @@ void DialogCurveIntersectAxis::ShowDialog(bool click)
         SCASSERT(line != nullptr)
 
         this->SetAngle(line->Angle());//Show in dialog angle what user choose
-        emit ToolTip("");
+        emit ToolTip(QString());
 
         DialogAccepted();// Just set default values and don't show dialog
     }
@@ -252,7 +252,7 @@ void DialogCurveIntersectAxis::ChosenObject(quint32 id, const SceneObject &type)
             case (1):
                 if (type == SceneObject::Point)
                 {
-                    if (SetObject(id, ui->comboBoxAxisPoint, ""))
+                    if (SetObject(id, ui->comboBoxAxisPoint, QString()))
                     {
                         line->setAxisPointId(id);
                         line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogcutarc.cpp

@@ -128,7 +128,7 @@ void DialogCutArc::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Arc)
         {
-            if (SetObject(id, ui->comboBoxArc, ""))
+            if (SetObject(id, ui->comboBoxArc, QString()))
             {
                 vis->VisualMode(id);
                 prepare = true;

src/libs/vtools/dialogs/tools/dialogcutspline.cpp

@@ -144,7 +144,7 @@ void DialogCutSpline::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Spline)
         {
-            if (SetObject(id, ui->comboBoxSpline, ""))
+            if (SetObject(id, ui->comboBoxSpline, QString()))
             {
                 vis->VisualMode(id);
                 prepare = true;

src/libs/vtools/dialogs/tools/dialogcutsplinepath.cpp

@@ -144,7 +144,7 @@ void DialogCutSplinePath::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::SplinePath)
         {
-            if (SetObject(id, ui->comboBoxSplinePath, ""))
+            if (SetObject(id, ui->comboBoxSplinePath, QString()))
             {
                 vis->VisualMode(id);
                 prepare = true;

src/libs/vtools/dialogs/tools/dialogellipticalarc.cpp

@@ -579,7 +579,7 @@ void DialogEllipticalArc::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Point)
         {
-            if (SetObject(id, ui->comboBoxBasePoint, ""))
+            if (SetObject(id, ui->comboBoxBasePoint, QString()))
             {
                 vis->VisualMode(id);
                 prepare = true;

src/libs/vtools/dialogs/tools/dialogendline.cpp

@@ -184,7 +184,7 @@ void DialogEndLine::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Point)
         {
-            if (SetObject(id, ui->comboBoxBasePoint, ""))
+            if (SetObject(id, ui->comboBoxBasePoint, QString()))
             {
                 vis->VisualMode(id);
                 VAbstractMainWindow *window = qobject_cast<VAbstractMainWindow *>(qApp->getMainWindow());
@@ -328,7 +328,7 @@ void DialogEndLine::ShowDialog(bool click)
 
         this->SetAngle(line->Angle());//Show in dialog angle what user choose
         this->SetFormula(line->Length());
-        emit ToolTip("");
+        emit ToolTip(QString());
         timerFormula->start();
         this->show();
     }

src/libs/vtools/dialogs/tools/dialogflippingbyaxis.cpp

@@ -183,7 +183,7 @@ void DialogFlippingByAxis::ShowDialog(bool click)
     else if (not stage1 && prepare && click)
     {
         setModal(true);
-        emit ToolTip("");
+        emit ToolTip(QString());
         show();
     }
 }
@@ -201,7 +201,7 @@ void DialogFlippingByAxis::ChosenObject(quint32 id, const SceneObject &type)
                 return;
             }
 
-            if (SetObject(id, ui->comboBoxOriginPoint, ""))
+            if (SetObject(id, ui->comboBoxOriginPoint, QString()))
             {
                 VisToolFlippingByAxis *operation = qobject_cast<VisToolFlippingByAxis *>(vis);
                 SCASSERT(operation != nullptr)

src/libs/vtools/dialogs/tools/dialogflippingbyline.cpp

@@ -180,7 +180,7 @@ void DialogFlippingByLine::ShowDialog(bool click)
     else if (not stage1 && prepare && click)
     {
         setModal(true);
-        emit ToolTip("");
+        emit ToolTip(QString());
         show();
     }
 }
@@ -219,7 +219,7 @@ void DialogFlippingByLine::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (getCurrentObjectId(ui->comboBoxFirstLinePoint) != id)
                     {
-                        if (SetObject(id, ui->comboBoxSecondLinePoint, ""))
+                        if (SetObject(id, ui->comboBoxSecondLinePoint, QString()))
                         {
                             if (flagError)
                             {

src/libs/vtools/dialogs/tools/dialoggroup.cpp

@@ -76,7 +76,7 @@ void DialogGroup::ShowDialog(bool click)
         SetName(tr("New group"));
 
         setModal(true);
-        emit ToolTip("");
+        emit ToolTip(QString());
         show();
     }
 }

src/libs/vtools/dialogs/tools/dialogheight.cpp

@@ -212,7 +212,7 @@ void DialogHeight::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (set.size() == 3)
                     {
-                        if (SetObject(id, ui->comboBoxP2Line, ""))
+                        if (SetObject(id, ui->comboBoxP2Line, QString()))
                         {
                             line->setLineP2Id(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogline.cpp

@@ -190,7 +190,7 @@ void DialogLine::ChosenObject(quint32 id, const SceneObject &type)
                 case 1:
                     if (getCurrentObjectId(ui->comboBoxFirstPoint) != id)
                     {
-                        if (SetObject(id, ui->comboBoxSecondPoint, ""))
+                        if (SetObject(id, ui->comboBoxSecondPoint, QString()))
                         {
                             if (flagError)
                             {

src/libs/vtools/dialogs/tools/dialoglineintersect.cpp

@@ -145,7 +145,7 @@ void DialogLineIntersect::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (set.size() >= 3)
                     {
-                        if (SetObject(id, ui->comboBoxP2Line2, ""))
+                        if (SetObject(id, ui->comboBoxP2Line2, QString()))
                         {
                             line->setLine2P2Id(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialoglineintersectaxis.cpp

@@ -244,7 +244,7 @@ void DialogLineIntersectAxis::ShowDialog(bool click)
         SCASSERT(line != nullptr)
 
         this->SetAngle(line->Angle());//Show in dialog angle what user choose
-        emit ToolTip("");
+        emit ToolTip(QString());
 
         DialogAccepted();// Just set default values and don't show dialog
     }
@@ -292,7 +292,7 @@ void DialogLineIntersectAxis::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (set.size() == 3)
                     {
-                        if (SetObject(id, ui->comboBoxAxisPoint, ""))
+                        if (SetObject(id, ui->comboBoxAxisPoint, QString()))
                         {
                             line->setAxisPointId(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogmove.cpp

@@ -310,7 +310,7 @@ void DialogMove::ShowDialog(bool click)
             if (not optionalRotationOrigin)
             {
                 operation->SetRotationOriginPointId(NULL_ID);
-                SetObject(NULL_ID, ui->comboBoxRotationOriginPoint, "");
+                SetObject(NULL_ID, ui->comboBoxRotationOriginPoint, QString());
                 operation->RefreshGeometry();
             }
             optionalRotationOrigin = false; // Handled, next click on empty filed will disable selection
@@ -321,7 +321,7 @@ void DialogMove::ShowDialog(bool click)
             SetLength(qApp->TrVars()->FormulaFromUser(formulaLength, qApp->Settings()->GetOsSeparator()));
             SetRotationAngle(operation->RotationAngle());
             setModal(true);
-            emit ToolTip("");
+            emit ToolTip(QString());
             timerAngle->start();
             timerRotationAngle->start();
             timerLength->start();
@@ -337,7 +337,7 @@ void DialogMove::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Point && QGuiApplication::keyboardModifiers() == Qt::ControlModifier)
         {
-            if (SetObject(id, ui->comboBoxRotationOriginPoint, ""))
+            if (SetObject(id, ui->comboBoxRotationOriginPoint, QString()))
             {
                 VisToolMove *operation = qobject_cast<VisToolMove *>(vis);
                 SCASSERT(operation != nullptr)

src/libs/vtools/dialogs/tools/dialognormal.cpp

@@ -176,7 +176,7 @@ void DialogNormal::ChosenObject(quint32 id, const SceneObject &type)
                 case 1:
                     if (getCurrentObjectId(ui->comboBoxFirstPoint) != id)
                     {
-                        if (SetObject(id, ui->comboBoxSecondPoint, ""))
+                        if (SetObject(id, ui->comboBoxSecondPoint, QString()))
                         {
                             line->setObject2Id(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogpointfromarcandtangent.cpp

@@ -152,7 +152,7 @@ void DialogPointFromArcAndTangent::ChosenObject(quint32 id, const SceneObject &t
                 case 1:
                     if (type == SceneObject::Arc)
                     {
-                        if (SetObject(id, ui->comboBoxArc, ""))
+                        if (SetObject(id, ui->comboBoxArc, QString()))
                         {
                             number = 0;
                             point->setArcId(id);

src/libs/vtools/dialogs/tools/dialogpointfromcircleandtangent.cpp

@@ -206,7 +206,7 @@ void DialogPointFromCircleAndTangent::ChosenObject(quint32 id, const SceneObject
                 case 1:
                     if (getCurrentObjectId(ui->comboBoxTangentPoint) != id)
                     {
-                        if (SetObject(id, ui->comboBoxCircleCenter, ""))
+                        if (SetObject(id, ui->comboBoxCircleCenter, QString()))
                         {
                             number = 0;
                             point->setObject2Id(id);

src/libs/vtools/dialogs/tools/dialogpointofcontact.cpp

@@ -197,7 +197,7 @@ void DialogPointOfContact::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (set.size() == 3)
                     {
-                        if (SetObject(id, ui->comboBoxCenter, ""))
+                        if (SetObject(id, ui->comboBoxCenter, QString()))
                         {
                             line->setRadiusId(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogpointofintersection.cpp

@@ -122,7 +122,7 @@ void DialogPointOfIntersection::ChosenObject(quint32 id, const SceneObject &type
                 case 1:
                     if (getCurrentObjectId(ui->comboBoxFirstPoint) != id)
                     {
-                        if (SetObject(id, ui->comboBoxSecondPoint, ""))
+                        if (SetObject(id, ui->comboBoxSecondPoint, QString()))
                         {
                             line->setPoint2Id(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogpointofintersectionarcs.cpp

@@ -155,7 +155,7 @@ void DialogPointOfIntersectionArcs::ChosenObject(quint32 id, const SceneObject &
                 case 1:
                     if (getCurrentObjectId(ui->comboBoxArc1) != id)
                     {
-                        if (SetObject(id, ui->comboBoxArc2, ""))
+                        if (SetObject(id, ui->comboBoxArc2, QString()))
                         {
                             number = 0;
                             point->setArc2Id(id);

src/libs/vtools/dialogs/tools/dialogpointofintersectioncircles.cpp

@@ -245,7 +245,7 @@ void DialogPointOfIntersectionCircles::ChosenObject(quint32 id, const SceneObjec
                 case 1:
                     if (getCurrentObjectId(ui->comboBoxCircle1Center) != id)
                     {
-                        if (SetObject(id, ui->comboBoxCircle2Center, ""))
+                        if (SetObject(id, ui->comboBoxCircle2Center, QString()))
                         {
                             number = 0;
                             point->setObject2Id(id);

src/libs/vtools/dialogs/tools/dialogpointofintersectioncurves.cpp

@@ -181,7 +181,7 @@ void DialogPointOfIntersectionCurves::ChosenObject(quint32 id, const SceneObject
                 case 1:
                     if (getCurrentObjectId(ui->comboBoxCurve1) != id)
                     {
-                        if (SetObject(id, ui->comboBoxCurve2, ""))
+                        if (SetObject(id, ui->comboBoxCurve2, QString()))
                         {
                             number = 0;
                             point->setObject2Id(id);

src/libs/vtools/dialogs/tools/dialogrotation.cpp

@@ -229,7 +229,7 @@ void DialogRotation::ShowDialog(bool click)
 
         SetAngle(operation->Angle());//Show in dialog angle that a user choose
         setModal(true);
-        emit ToolTip("");
+        emit ToolTip(QString());
         timerAngle->start();
         show();
     }
@@ -253,7 +253,7 @@ void DialogRotation::ChosenObject(quint32 id, const SceneObject &type)
                 operation->SetObjects(objects.toVector());
             }
 
-            if (SetObject(id, ui->comboBoxOriginPoint, ""))
+            if (SetObject(id, ui->comboBoxOriginPoint, QString()))
             {
                 VAbstractMainWindow *window = qobject_cast<VAbstractMainWindow *>(qApp->getMainWindow());
                 SCASSERT(window != nullptr)

src/libs/vtools/dialogs/tools/dialogshoulderpoint.cpp

@@ -201,7 +201,7 @@ void DialogShoulderPoint::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (set.size() == 3)
                     {
-                        if (SetObject(id, ui->comboBoxP2Line, ""))
+                        if (SetObject(id, ui->comboBoxP2Line, QString()))
                         {
                             line->setLineP2Id(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogspline.cpp

@@ -175,7 +175,7 @@ void DialogSpline::ChosenObject(quint32 id, const SceneObject &type)
                 {
                     if (getCurrentObjectId(ui->comboBoxP1) != id)
                     {
-                        if (SetObject(id, ui->comboBoxP4, ""))
+                        if (SetObject(id, ui->comboBoxP4, QString()))
                         {
                             ++number;
 

src/libs/vtools/dialogs/tools/dialogsplinepath.cpp

@@ -687,7 +687,7 @@ void DialogSplinePath::ShowDialog(bool click)
     {
         if (path.CountPoints() >= 3)
         {
-            emit ToolTip("");
+            emit ToolTip(QString());
 
             if (not data->IsUnique(path.name()))
             {

src/libs/vtools/dialogs/tools/dialogtool.cpp

@@ -168,7 +168,7 @@ DialogTool::DialogTool(const VContainer *data, const quint32 &toolId, QWidget *p
 //---------------------------------------------------------------------------------------------------------------------
 DialogTool::~DialogTool()
 {
-    emit ToolTip("");
+    emit ToolTip(QString());
 
     if (not vis.isNull())
     {
@@ -327,7 +327,7 @@ void DialogTool::FillComboBoxTypeLine(QComboBox *box, const QMap<QString, QIcon>
     QMap<QString, QIcon>::const_iterator i = stylesPics.constBegin();
     while (i != stylesPics.constEnd())
     {
-        box->addItem(i.value(), "", QVariant(i.key()));
+        box->addItem(i.value(), QString(), QVariant(i.key()));
         ++i;
     }
 
@@ -845,7 +845,7 @@ qreal DialogTool::Eval(const QString &text, bool &flag, QLabel *label, const QSt
                     flag = true;
                     ChangeColor(labelEditFormula, okColor);
                     label->setToolTip(tr("Value"));
-                    emit ToolTip("");
+                    emit ToolTip(QString());
                 }
             }
         }

src/libs/vtools/dialogs/tools/dialogtriangle.cpp

@@ -148,7 +148,7 @@ void DialogTriangle::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (set.size() == 4)
                     {
-                        if (SetObject(id, ui->comboBoxSecondPoint, ""))
+                        if (SetObject(id, ui->comboBoxSecondPoint, QString()))
                         {
                             line->setHypotenuseP2Id(id);
                             line->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialogtruedarts.cpp

@@ -290,7 +290,7 @@ void DialogTrueDarts::ChosenObject(quint32 id, const SceneObject &type)
 
                     if (set.size() == 5)
                     {
-                        if (SetObject(id, ui->comboBoxThirdDartPoint, ""))
+                        if (SetObject(id, ui->comboBoxThirdDartPoint, QString()))
                         {
                             points->setD3PointId(id);
                             points->RefreshGeometry();

src/libs/vtools/dialogs/tools/dialoguniondetails.cpp

@@ -174,7 +174,7 @@ void DialogUnionDetails::ChoosedDetail(const quint32 &id, const SceneObject &typ
                 if (numberD > 1)
                 {
                     ++numberP;
-                    emit ToolTip("");
+                    emit ToolTip(QString());
                     this->setModal(true);
                     this->show();
                 }

src/libs/vtools/dialogs/tools/piece/dialogduplicatedetail.cpp

@@ -71,7 +71,7 @@ void DialogDuplicateDetail::ShowDialog(bool click)
 
             m_mx = piece->Mx();
             m_my = piece->My();
-            emit ToolTip("");
+            emit ToolTip(QString());
             DialogAccepted();
         }
     }

src/libs/vtools/dialogs/tools/piece/dialogpiecepath.cpp

@@ -184,7 +184,7 @@ void DialogPiecePath::ShowDialog(bool click)
     {
         if (CreatePath().CountNodes() > 0)
         {
-            emit ToolTip("");
+            emit ToolTip(QString());
             prepare = true;
 
             if (not m_showMode)
@@ -432,8 +432,8 @@ void DialogPiecePath::NodeChanged(int index)
     }
     else
     {
-        ui->plainTextEditFormulaWidthBefore->setPlainText("");
+        ui->plainTextEditFormulaWidthBefore->setPlainText(QString());
-        ui->plainTextEditFormulaWidthAfter->setPlainText("");
+        ui->plainTextEditFormulaWidthAfter->setPlainText(QString());
         ui->comboBoxAngle->setCurrentIndex(-1);
     }
 
@@ -717,7 +717,7 @@ void DialogPiecePath::EvalVisible()
 {
     labelEditFormula = ui->labelEditVisible;
     QString formula = ui->plainTextEditFormulaVisible->toPlainText();
-    Eval(formula, m_flagFormulaVisible, ui->labelResultVisible, "", false, true);
+    Eval(formula, m_flagFormulaVisible, ui->labelResultVisible, QString(), false, true);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -806,7 +806,7 @@ void DialogPiecePath::VisibleChanged()
 {
     labelEditFormula = ui->labelEditVisible;
     labelResultCalculation = ui->labelResultVisible;
-    ValFormulaChanged(m_flagFormulaVisible, ui->plainTextEditFormulaVisible, m_timerVisible, "");
+    ValFormulaChanged(m_flagFormulaVisible, ui->plainTextEditFormulaVisible, m_timerVisible, QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vtools/dialogs/tools/piece/dialogpin.cpp

@@ -125,7 +125,7 @@ void DialogPin::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Point)
         {
-            if (SetObject(id, ui->comboBoxPoint, ""))
+            if (SetObject(id, ui->comboBoxPoint, QString()))
             {
                 vis->VisualMode(id);
                 CheckPoint();

src/libs/vtools/dialogs/tools/piece/dialogplacelabel.cpp

@@ -266,7 +266,7 @@ void DialogPlaceLabel::ChosenObject(quint32 id, const SceneObject &type)
     {
         if (type == SceneObject::Point)
         {
-            if (SetObject(id, ui->comboBoxPoint, ""))
+            if (SetObject(id, ui->comboBoxPoint, QString()))
             {
                 vis->VisualMode(id);
                 CheckPoint();

src/libs/vtools/dialogs/tools/piece/dialogseamallowance.cpp

@@ -452,7 +452,7 @@ void DialogSeamAllowance::ShowDialog(bool click)
 {
     if (click == false && uiTabPaths->listWidgetMainPath->count() > 0)
     {
-        emit ToolTip("");
+        emit ToolTip(QString());
         prepare = true;
 
         if (not applyAllowed)

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toolcut/vtoolcutarc.cpp

@@ -223,7 +223,7 @@ void VToolCutArc::SaveOptions(QDomElement &tag, QSharedPointer<VGObject> &obj)
 //---------------------------------------------------------------------------------------------------------------------
 void VToolCutArc::ReadToolAttributes(const QDomElement &domElement)
 {
-    formula = doc->GetParametrString(domElement, AttrLength, "");
+    formula = doc->GetParametrString(domElement, AttrLength, QString());
     curveCutId = doc->GetParametrUInt(domElement, AttrArc, NULL_ID_STR);
 }
 

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toolcut/vtoolcutspline.cpp

@@ -222,7 +222,7 @@ void VToolCutSpline::SaveOptions(QDomElement &tag, QSharedPointer<VGObject> &obj
 //---------------------------------------------------------------------------------------------------------------------
 void VToolCutSpline::ReadToolAttributes(const QDomElement &domElement)
 {
-    formula = doc->GetParametrString(domElement, AttrLength, "");
+    formula = doc->GetParametrString(domElement, AttrLength, QString());
     curveCutId = doc->GetParametrUInt(domElement, AttrSpline, NULL_ID_STR);
 }
 

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toolcut/vtoolcutsplinepath.cpp

@@ -313,7 +313,7 @@ void VToolCutSplinePath::SaveOptions(QDomElement &tag, QSharedPointer<VGObject>
 //---------------------------------------------------------------------------------------------------------------------
 void VToolCutSplinePath::ReadToolAttributes(const QDomElement &domElement)
 {
-    formula = doc->GetParametrString(domElement, AttrLength, "");
+    formula = doc->GetParametrString(domElement, AttrLength, QString());
     curveCutId = doc->GetParametrUInt(domElement, AttrSplinePath, NULL_ID_STR);
 }
 

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toollinepoint/vtoolalongline.cpp

@@ -123,7 +123,7 @@ void VToolAlongLine::ReadToolAttributes(const QDomElement &domElement)
 {
     m_lineType = doc->GetParametrString(domElement, AttrTypeLine, TypeLineLine);
     lineColor = doc->GetParametrString(domElement, AttrLineColor, ColorBlack);
-    formulaLength = doc->GetParametrString(domElement, AttrLength, "");
+    formulaLength = doc->GetParametrString(domElement, AttrLength, QString());
     basePointId = doc->GetParametrUInt(domElement, AttrFirstPoint, NULL_ID_STR);
     secondPointId = doc->GetParametrUInt(domElement, AttrSecondPoint, NULL_ID_STR);
 }

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toollinepoint/vtoolbisector.cpp

@@ -280,7 +280,7 @@ void VToolBisector::ReadToolAttributes(const QDomElement &domElement)
 {
     m_lineType = doc->GetParametrString(domElement, AttrTypeLine, TypeLineLine);
     lineColor = doc->GetParametrString(domElement, AttrLineColor, ColorBlack);
-    formulaLength = doc->GetParametrString(domElement, AttrLength, "");
+    formulaLength = doc->GetParametrString(domElement, AttrLength, QString());
     firstPointId = doc->GetParametrUInt(domElement, AttrFirstPoint, NULL_ID_STR);
     basePointId = doc->GetParametrUInt(domElement, AttrSecondPoint, NULL_ID_STR);
     thirdPointId = doc->GetParametrUInt(domElement, AttrThirdPoint, NULL_ID_STR);

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toollinepoint/vtoolcurveintersectaxis.cpp

@@ -315,7 +315,7 @@ void VToolCurveIntersectAxis::ReadToolAttributes(const QDomElement &domElement)
     lineColor = doc->GetParametrString(domElement, AttrLineColor, ColorBlack);
     basePointId = doc->GetParametrUInt(domElement, AttrBasePoint, NULL_ID_STR);
     curveId = doc->GetParametrUInt(domElement, AttrCurve, NULL_ID_STR);
-    formulaAngle = doc->GetParametrString(domElement, AttrAngle, "");
+    formulaAngle = doc->GetParametrString(domElement, AttrAngle, QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toollinepoint/vtoolendline.cpp

@@ -208,9 +208,9 @@ void VToolEndLine::ReadToolAttributes(const QDomElement &domElement)
 {
     m_lineType = doc->GetParametrString(domElement, AttrTypeLine, TypeLineLine);
     lineColor = doc->GetParametrString(domElement, AttrLineColor, ColorBlack);
-    formulaLength = doc->GetParametrString(domElement, AttrLength, "");
+    formulaLength = doc->GetParametrString(domElement, AttrLength, QString());
     basePointId = doc->GetParametrUInt(domElement, AttrBasePoint, NULL_ID_STR);
-    formulaAngle = doc->GetParametrString(domElement, AttrAngle, "");
+    formulaAngle = doc->GetParametrString(domElement, AttrAngle, QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toollinepoint/vtoollineintersectaxis.cpp

@@ -285,7 +285,7 @@ void VToolLineIntersectAxis::ReadToolAttributes(const QDomElement &domElement)
     basePointId = doc->GetParametrUInt(domElement, AttrBasePoint, NULL_ID_STR);
     firstPointId = doc->GetParametrUInt(domElement, AttrP1Line, NULL_ID_STR);
     secondPointId = doc->GetParametrUInt(domElement, AttrP2Line, NULL_ID_STR);
-    formulaAngle = doc->GetParametrString(domElement, AttrAngle, "");
+    formulaAngle = doc->GetParametrString(domElement, AttrAngle, QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toollinepoint/vtoolnormal.cpp

@@ -251,7 +251,7 @@ void VToolNormal::ReadToolAttributes(const QDomElement &domElement)
 {
     m_lineType = doc->GetParametrString(domElement, AttrTypeLine, TypeLineLine);
     lineColor = doc->GetParametrString(domElement, AttrLineColor, ColorBlack);
-    formulaLength = doc->GetParametrString(domElement, AttrLength, "");
+    formulaLength = doc->GetParametrString(domElement, AttrLength, QString());
     basePointId = doc->GetParametrUInt(domElement, AttrFirstPoint, NULL_ID_STR);
     secondPointId = doc->GetParametrUInt(domElement, AttrSecondPoint, NULL_ID_STR);
     angle = doc->GetParametrDouble(domElement, AttrAngle, "0");

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/toollinepoint/vtoolshoulderpoint.cpp

@@ -298,7 +298,7 @@ void VToolShoulderPoint::ReadToolAttributes(const QDomElement &domElement)
 {
     m_lineType = doc->GetParametrString(domElement, AttrTypeLine, TypeLineLine);
     lineColor = doc->GetParametrString(domElement, AttrLineColor, ColorBlack);
-    formulaLength = doc->GetParametrString(domElement, AttrLength, "");
+    formulaLength = doc->GetParametrString(domElement, AttrLength, QString());
     basePointId = doc->GetParametrUInt(domElement, AttrP1Line, NULL_ID_STR);
     p2Line = doc->GetParametrUInt(domElement, AttrP2Line, NULL_ID_STR);
     pShoulder = doc->GetParametrUInt(domElement, AttrPShoulder, NULL_ID_STR);

src/libs/vtools/tools/drawTools/toolpoint/toolsinglepoint/vtoolpointofcontact.cpp

@@ -310,7 +310,7 @@ void VToolPointOfContact::SaveOptions(QDomElement &tag, QSharedPointer<VGObject>
 //---------------------------------------------------------------------------------------------------------------------
 void VToolPointOfContact::ReadToolAttributes(const QDomElement &domElement)
 {
-    arcRadius = doc->GetParametrString(domElement, AttrRadius, "");
+    arcRadius = doc->GetParametrString(domElement, AttrRadius, QString());
     center = doc->GetParametrUInt(domElement, AttrCenter, NULL_ID_STR);
     firstPointId = doc->GetParametrUInt(domElement, AttrFirstPoint, NULL_ID_STR);
     secondPointId = doc->GetParametrUInt(domElement, AttrSecondPoint, NULL_ID_STR);

src/libs/vtools/tools/drawTools/vdrawtool.h

@@ -250,7 +250,7 @@ QString VDrawTool::ObjectName(quint32 id) const
         qCDebug(vTool, "Error! Couldn't get object name by id = %s. %s %s", qUtf8Printable(QString().setNum(id)),
                 qUtf8Printable(e.ErrorMessage()),
                 qUtf8Printable(e.DetailedInformation()));
-        return QString("");// Return empty string for property browser
+        return QString(QString());// Return empty string for property browser
     }
 }
 

src/libs/vtools/undocommands/deletepatternpiece.cpp

@@ -47,7 +47,7 @@ DeletePatternPiece::DeletePatternPiece(VAbstractPattern *doc, const QString &nam
     const QDomElement previousPP = patternP.previousSibling().toElement();//find previous pattern piece
     if (not previousPP.isNull() && previousPP.tagName() == VAbstractPattern::TagDraw)
     {
-        previousPPName = doc->GetParametrString(previousPP, VAbstractPattern::AttrName, "");
+        previousPPName = doc->GetParametrString(previousPP, VAbstractPattern::AttrName, QString());
     }
 }
 

src/libs/vtools/visualization/path/vistoolcubicbezierpath.cpp

@@ -295,7 +295,7 @@ void VisToolCubicBezierPath::RefreshToolTip()
 
         if (mode == Mode::Show)
         {
-            Visualization::toolTip = "";
+            Visualization::toolTip = QString();
         }
         emit ToolTip(Visualization::toolTip);
     }

src/libs/vtools/visualization/path/vistoolspline.cpp

@@ -80,7 +80,7 @@ VisToolSpline::VisToolSpline(const VContainer *data, QGraphicsItem *parent)
 //---------------------------------------------------------------------------------------------------------------------
 VisToolSpline::~VisToolSpline()
 {
-    emit ToolTip("");
+    emit ToolTip(QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/libs/vtools/visualization/path/vistoolsplinepath.cpp

@@ -63,7 +63,7 @@ VisToolSplinePath::VisToolSplinePath(const VContainer *data, QGraphicsItem *pare
 //---------------------------------------------------------------------------------------------------------------------
 VisToolSplinePath::~VisToolSplinePath()
 {
-    emit ToolTip("");
+    emit ToolTip(QString());
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/test/ValentinaTest/tst_misc.cpp

@@ -55,18 +55,18 @@ void TST_Misc::TestRelativeFilePath_data()
             << "/home/user/patterns/pattern.val" << "/home/user/patterns/m.vit" << "m.vit";
 
     QTest::newRow("Path to measurements is empty")
-            << "/home/user/patterns/pattern.val" << "" << "";
+            << "/home/user/patterns/pattern.val" << QString() << QString();
 
     QTest::newRow("Path to a pattern file is empty. Ablosute measurements path.")
-            << "" << "/home/user/patterns/m.vit" << "/home/user/patterns/m.vit";
+            << QString() << "/home/user/patterns/m.vit" << "/home/user/patterns/m.vit";
 
     QTest::newRow("Path to a pattern file is empty. Relative measurements path.")
-            << "" << "measurements/m.vit" << "measurements/m.vit";
+            << QString() << "measurements/m.vit" << "measurements/m.vit";
 
     QTest::newRow("Relative measurements path.")
             << "/home/user/patterns/pattern.val" << "../measurements/m.vit" << "../measurements/m.vit";
 
-    QTest::newRow("Both paths are empty") << "" << "" << "";
+    QTest::newRow("Both paths are empty") << QString() << QString() << QString();
 
     QTest::newRow("Path to measurements is relative")
             << "/home/user/patterns/pattern.val" << "m.vit" << "m.vit";
@@ -114,15 +114,15 @@ void TST_Misc::TestAbsoluteFilePath_data()
 
     QTest::newRow("Path to measurements is empty")
             << QCoreApplication::applicationDirPath() + QStringLiteral("/home/user/patterns/pattern.val")
-            << "" << "";
+            << QString() << QString();
 
     QTest::newRow("Path to a pattern file is empty. Ablosute measurements path.")
-            << ""
+            << QString()
             << QCoreApplication::applicationDirPath() + QStringLiteral("/home/user/patterns/m.vit")
             << QCoreApplication::applicationDirPath() + QStringLiteral("/home/user/patterns/m.vit");
 
     QTest::newRow("Path to a pattern file is empty. Relative measurements path.")
-            << ""
+            << QString()
             << "measurements/m.vit"
             << "measurements/m.vit";
 
@@ -131,7 +131,7 @@ void TST_Misc::TestAbsoluteFilePath_data()
             << "../measurements/m.vit"
             << QCoreApplication::applicationDirPath() + QStringLiteral("/home/user/measurements/m.vit");
 
-    QTest::newRow("Both paths are empty") << "" << "" << "";
+    QTest::newRow("Both paths are empty") << QString() << QString() << QString();
 
     QTest::newRow("Path to measurements is relative")
             << QCoreApplication::applicationDirPath() + QStringLiteral("/home/user/patterns/pattern.val")
@@ -153,18 +153,18 @@ void TST_Misc::TestAbsoluteFilePath_data()
             << "/home/user/patterns/pattern.val" << "m.vit" << "/home/user/patterns/m.vit";
 
     QTest::newRow("Path to measurements is empty")
-            << "/home/user/patterns/pattern.val" << "" << "";
+            << "/home/user/patterns/pattern.val" << QString() << QString();
 
     QTest::newRow("Path to a pattern file is empty. Ablosute measurements path.")
-            << "" << "/home/user/patterns/m.vit" << "/home/user/patterns/m.vit";
+            << QString() << "/home/user/patterns/m.vit" << "/home/user/patterns/m.vit";
 
     QTest::newRow("Path to a pattern file is empty. Relative measurements path.")
-            << "" << "measurements/m.vit" << "measurements/m.vit";
+            << QString() << "measurements/m.vit" << "measurements/m.vit";
 
     QTest::newRow("Relative measurements path.")
             << "/home/user/patterns/pattern.val" << "../measurements/m.vit" << "/home/user/measurements/m.vit";
 
-    QTest::newRow("Both paths are empty") << "" << "" << "";
+    QTest::newRow("Both paths are empty") << QString() << QString() << QString();
 
     QTest::newRow("Path to measurements is relative")
             << "/home/user/patterns/pattern.val" << "m.vit" << "/home/user/patterns/m.vit";

src/test/ValentinaTest/tst_qmutokenparser.cpp

@@ -45,7 +45,7 @@ void TST_QmuTokenParser::IsSingle_data()
     QTest::addColumn<QString>("formula");
     QTest::addColumn<bool>("result");
 
-    QTest::newRow("Empty string") << "" << false;
+    QTest::newRow("Empty string") << QString() << false;
     QTest::newRow("Single value") << "15.5" << true;
     QTest::newRow("Two digits") << "2+2" << false;
     QTest::newRow("Two digits") << "2-2" << false;
@@ -53,7 +53,7 @@ void TST_QmuTokenParser::IsSingle_data()
     QTest::newRow("Digit and variable") << "2+a" << false;
     QTest::newRow("One variable twice") << "a+a" << false;
     QTest::newRow("Two variables") << "a+b" << false;
-    QTest::newRow("Empty string") << "" << false;
+    QTest::newRow("Empty string") << QString() << false;
     QTest::newRow("Several spaces") << "   " << false;
     QTest::newRow("Invalid formula") << "2*)))" << false;
     QTest::newRow("Invalid formula") << "2*" << false;

src/test/ValentinaTest/tst_vspline.cpp

@@ -704,8 +704,8 @@ void TST_VSpline::CompareThreeWays()
     VSpline spl2(spl1.GetP1(), static_cast<QPointF>(spl1.GetP2()), static_cast<QPointF>(spl1.GetP3()), spl1.GetP4(), 1);
     spl2.SetApproximationScale(10);
 
-    VSpline spl3(spl1.GetP1(), spl1.GetP4(), spl1.GetStartAngle(), "", spl2.GetEndAngle(), "", spl2.GetC1Length(), "",
+    VSpline spl3(spl1.GetP1(), spl1.GetP4(), spl1.GetStartAngle(), QString(), spl2.GetEndAngle(), QString(), spl2.GetC1Length(), QString(),
-                 spl2.GetC2Length(), "", 1);
+                 spl2.GetC2Length(), QString(), 1);
     spl3.SetApproximationScale(10);
 
     QWARN("Comparing first and second splines.");

src/test/ValentinaTest/tst_vtranslatevars.cpp

@@ -132,7 +132,7 @@ void TST_VTranslateVars::PrepareValToUser(double d, const QLocale &locale)
     QString formulaToUser = locale.toString(d);
     if (locale.groupSeparator().isSpace())
     {
-        formulaToUser.replace(locale.groupSeparator(), "");
+        formulaToUser.replace(locale.groupSeparator(), QString());
     }
 
     PrepareVal(formulaFromSystem, formulaToUser, locale);