From ae549bf94817fa75a11566f88ef50db1cad93dce Mon Sep 17 00:00:00 2001
From: Roman Telezhynskyi <dismine@gmail.com>
Date: Sun, 13 Aug 2023 19:58:58 +0300
Subject: [PATCH] Activate custom stylesheet to mimic dark mode on Qt versions
 those do not support native dark mode.

---
 src/libs/vmisc/theme/vtheme.cpp | 59 ++++++++++++++++++++++++++++-----
 1 file changed, 51 insertions(+), 8 deletions(-)

diff --git a/src/libs/vmisc/theme/vtheme.cpp b/src/libs/vmisc/theme/vtheme.cpp
index 5da45f933..f49421615 100644
--- a/src/libs/vmisc/theme/vtheme.cpp
+++ b/src/libs/vmisc/theme/vtheme.cpp
@@ -217,13 +217,60 @@ void ActivateCustomDarkTheme()
     }
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+#if defined(Q_OS_WIN)
+void ActivateDefaultThemeWin()
+{
+#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
+    qApp->setStyleSheet(QString()); // NOLINT(cppcoreguidelines-pro-type-static-cast-downcast)
+#else
+    if (VTheme::IsInDarkTheme())
+    {
+        ActivateCustomDarkTheme();
+    }
+    else
+    {
+        ActivateCustomLightTheme();
+    }
+#endif // QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
+}
+#endif // defined(Q_OS_WIN)
+
+//---------------------------------------------------------------------------------------------------------------------
+#if defined(Q_OS_MACX)
+void ActivateDefaultThemeMac()
+{
+#if QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
+    qApp->setStyleSheet(QString()); // NOLINT(cppcoreguidelines-pro-type-static-cast-downcast)
+#else
+    if (VTheme::IsInDarkTheme())
+    {
+        ActivateCustomDarkTheme();
+    }
+    else
+    {
+        ActivateCustomLightTheme();
+    }
+#endif // QT_VERSION >= QT_VERSION_CHECK(5, 12, 0)
+}
+#endif // defined(Q_OS_MACX)
+
 //---------------------------------------------------------------------------------------------------------------------
 void ActivateDefaultTheme()
 {
-    qApp->setStyleSheet(QString()); // NOLINT(cppcoreguidelines-pro-type-static-cast-downcast)
-
-#if defined(Q_OS_MACX)
-    NSMacSetToAutoTheme();
+#if defined(Q_OS_WIN)
+    ActivateDefaultThemeWin();
+#elif defined(Q_OS_MACX)
+    ActivateDefaultThemeMac();
+#else
+    if (VTheme::IsInDarkTheme())
+    {
+        ActivateCustomDarkTheme();
+    }
+    else
+    {
+        ActivateCustomLightTheme();
+    }
 #endif
 }
 
@@ -466,10 +513,6 @@ void VTheme::InitThemeMode()
             {
                 ActivateCustomDarkTheme();
             }
-            else
-            {
-                ActivateCustomLightTheme();
-            }
         }
     }
 }