Theming: Allow to apply theme palette globally

Change-Id: I709bd6b6c566e016731af1fb94ddaef6326ef485
Reviewed-by: Thorben Kroeger <thorbenkroeger@gmail.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

share/qtcreator/themes/dark.creatortheme

@@ -108,6 +108,7 @@ DrawIndicatorBranch=true
 DrawProgressBarSunken=false
 DrawSearchResultWidgetFrame=false
 DrawTargetSelectorBottom=false
+ApplyThemePaletteGlobally=true
 
 [Gradients]
 DetailsWidgetHeaderGradient\1\color=0

share/qtcreator/themes/default.creatortheme

@@ -102,6 +102,7 @@ DrawIndicatorBranch=false
 DrawProgressBarSunken=true
 DrawSearchResultWidgetFrame=true
 DrawTargetSelectorBottom=true
+ApplyThemePaletteGlobally=false
 
 [Gradients]
 DetailsWidgetHeaderGradient\1\color=ffffff

src/libs/utils/theme/theme.h

@@ -184,7 +184,8 @@ public:
         DrawProgressBarSunken,
         DrawIndicatorBranch,
         ComboBoxDrawTextShadow,
-        DerivePaletteFromTheme
+        DerivePaletteFromTheme,
+        ApplyThemePaletteGlobally
     };
 
     enum WidgetStyle {

src/plugins/coreplugin/coreplugin.cpp

@@ -131,6 +131,8 @@ void CorePlugin::parseArguments(const QStringList &arguments)
     Theme *theme = new Theme(qApp);
     theme->readSettings(themeSettings);
     setCreatorTheme(theme);
+    if (theme->flag(Theme::ApplyThemePaletteGlobally))
+        QApplication::setPalette(creatorTheme()->palette(QApplication::palette()));
 
     // defer creation of these widgets until here,
     // because they need a valid theme set

src/plugins/coreplugin/themesettings.cpp

@@ -434,6 +434,8 @@ void ThemeSettings::apply()
 
     {
         d->m_ui->editor->model()->toTheme(creatorTheme());
+        if (creatorTheme()->flag(Theme::ApplyThemePaletteGlobally))
+            QApplication::setPalette(creatorTheme()->palette(QApplication::palette()));
         foreach (QWidget *w, QApplication::topLevelWidgets())
             w->update();
     }