Force usage of custom theme under Mac OS

source/carla_app.py

@@ -66,9 +66,11 @@ class CarlaApplication(object):
             self.createApp(appName)
             return
 
+        forceTheme  = MACOS or (WINDOWS and not config_UseQt5)
+
         # base settings
         settings    = QSettings("falkTX", appName)
-        useProTheme = settings.value(CARLA_KEY_MAIN_USE_PRO_THEME, CARLA_DEFAULT_MAIN_USE_PRO_THEME, type=bool)
+        useProTheme = forceTheme or settings.value(CARLA_KEY_MAIN_USE_PRO_THEME, CARLA_DEFAULT_MAIN_USE_PRO_THEME, type=bool)
 
         if not useProTheme:
             self.createApp(appName)
@@ -88,7 +90,7 @@ class CarlaApplication(object):
         # set palette
         proThemeColor = settings.value(CARLA_KEY_MAIN_PRO_THEME_COLOR, CARLA_DEFAULT_MAIN_PRO_THEME_COLOR, type=str).lower()
 
-        if proThemeColor == "black":
+        if forceTheme or proThemeColor == "black":
             self.fPalBlack = QPalette()
             self.fPalBlack.setColor(QPalette.Disabled, QPalette.Window, QColor(14, 14, 14))
             self.fPalBlack.setColor(QPalette.Active,   QPalette.Window, QColor(17, 17, 17))

source/carla_settings.py

@@ -234,8 +234,9 @@ class CarlaSettingsW(QDialog):
         for i in range(Theme.THEME_MAX):
             self.ui.cb_canvas_theme.addItem(getThemeName(i))
 
-        if WINDOWS and not config_UseQt5:
+        if MACOS or (WINDOWS and not config_UseQt5):
             self.ui.group_main_theme.setEnabled(False)
+            self.ui.group_main_theme.setVisible(False)
 
         if host.isControl:
             self.ui.lw_page.hideRow(self.TAB_INDEX_CANVAS)