Calculate fullscreencotnrollers position only when screen has changed

modules/gui/qt4/components/controller.cpp

@@ -769,6 +769,7 @@ FullscreenControllerWidget::FullscreenControllerWidget( intf_thread_t *_p_i )
     b_fullscreen        = false;
     i_hide_timeout      = 1;
     p_vout              = NULL;
+    i_screennumber      = -1;
 
     setWindowFlags( Qt::ToolTip );
     setMinimumWidth( 600 );
@@ -845,6 +846,11 @@ void FullscreenControllerWidget::showFSC()
     adjustSize();
     /* center down */
     int number = QApplication::desktop()->screenNumber( p_intf->p_sys->p_mi );
+    if( number != i_screennumber )
+    {
+        msg_Dbg( p_intf, "Calculation fullscreen controllers center");
+        /* screen has changed, calculate new position */
+        i_screennumber = number;
         int totalCount = QApplication::desktop()->numScreens();
         QRect screenRes = QApplication::desktop()->screenGeometry(number);
         int offset_x = 0;
@@ -867,6 +873,7 @@ void FullscreenControllerWidget::showFSC()
         QPoint pos = QPoint( offset_x + (screenRes.width() / 2) - (width() / 2),
                              offset_y + screenRes.height() - height());
         move( pos );
+    }
 #ifdef WIN32TRICK
     // after quiting and going to fs, we need to call show()
     if( isHidden() )

modules/gui/qt4/components/controller.hpp

@@ -286,6 +286,7 @@ private:
 
     int i_mouse_last_x, i_mouse_last_y;
     bool b_mouse_over;
+    int i_screennumber;
 
 #ifdef WIN32TRICK
     bool b_fscHidden;