Qt: do not loose fullscreen controller after customization

Close #6116
(cherry picked from commit 12667979)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/input_manager.hpp

@@ -263,6 +263,8 @@ public:
 
     bool getPlayExitState();
     bool hasEmptyPlaylist();
+
+    void requestVoutUpdate() { return im->UpdateVout(); }
 private:
     MainInputManager( intf_thread_t * );
     virtual ~MainInputManager();

modules/gui/qt4/main_interface.cpp

@@ -348,6 +348,7 @@ void MainInterface::recreateToolbars()
         fullscreenControls = new FullscreenControllerWidget( p_intf, this );
         CONNECT( fullscreenControls, keyPressed( QKeyEvent * ),
                  this, handleKeyPress( QKeyEvent * ) );
+        THEMIM->requestVoutUpdate();
     }
 }