Finished implementing maximize for linux.

Added FloatingContainerForc*TitleBar to switch between native and custom titlebar.

Co-authored-by: SleepProgger <SleepProgger@users.noreply.github.com>

src/DockFocusController.cpp

@@ -83,6 +83,9 @@ static void updateDockAreaFocusStyle(CDockAreaWidget* DockArea, bool Focused)
 #ifdef Q_OS_LINUX
 static void updateFloatingWidgetFocusStyle(CFloatingDockContainer* FloatingWidget, bool Focused)
 {
+	if(FloatingWidget->hasNativeTitleBar()){
+		return;
+	}
     auto TitleBar = qobject_cast<CFloatingWidgetTitleBar*>(FloatingWidget->titleBarWidget());
     if (!TitleBar)
     {