Warn the main window about a layout change.

src/app/puzzle/undocommands/vpundoaddsheet.cpp

@@ -80,6 +80,7 @@ void VPUndoAddSheet::redo()
     layout->AddSheet(sheet);
     emit layout->SheetListChanged();
     layout->SetFocusedSheet(sheet);
+    emit layout->LayoutChanged();
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/app/puzzle/undocommands/vpundomovepieceonsheet.cpp

@@ -123,6 +123,7 @@ void VPUndoMovePieceOnSheet::redo()
         {
             emit layout->PieceSheetChanged(piece);
             emit layout->PieceTransformationChanged(piece);
+            emit layout->LayoutChanged();
         }
     }
 }

src/app/puzzle/undocommands/vpundooriginmove.cpp

@@ -90,6 +90,7 @@ void VPUndoOriginMove::redo()
 
     sheet->SetTransformationOrigin(m_origin);
     emit layout->TransformationOriginChanged();
+    emit layout->LayoutChanged();
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/app/puzzle/undocommands/vpundopiecemove.cpp

@@ -90,6 +90,7 @@ void VPUndoPieceMove::redo()
 
     piece->Translate(m_dx, m_dy);
     emit layout->PieceTransformationChanged(piece);
+    emit layout->LayoutChanged();
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -204,6 +205,8 @@ void VPUndoPiecesMove::redo()
             emit layout->PieceTransformationChanged(p);
         }
     }
+
+    emit layout->LayoutChanged();
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/app/puzzle/undocommands/vpundopiecerotate.cpp

@@ -132,6 +132,8 @@ void VPUndoPieceRotate::redo()
     {
         m_firstCall = false;
     }
+
+    emit layout->LayoutChanged();
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -279,6 +281,8 @@ void VPUndoPiecesRotate::redo()
     {
         m_firstCall = false;
     }
+
+    emit layout->LayoutChanged();
 }
 
 //---------------------------------------------------------------------------------------------------------------------

src/app/puzzle/undocommands/vpundoremovesheet.cpp

@@ -111,10 +111,11 @@ void VPUndoRemoveSheet::redo()
 
     emit layout->SheetListChanged();
     layout->SetFocusedSheet(VPSheetPtr());
+    emit layout->LayoutChanged();
 }
 
 //---------------------------------------------------------------------------------------------------------------------
-int VPUndoRemoveSheet::id() const
+auto VPUndoRemoveSheet::id() const -> int
 {
     return static_cast<int>(ML::UndoCommand::RemoveSheet);
 }