Qt4: Fix FSController glitches on Linux/KDE

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit ffe7367b1672ec72705ec4cb440758ec0c869230)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/components/controller.cpp

@@ -43,6 +43,7 @@
 #include <QSpacerItem>
 #include <QToolButton>
 #include <QHBoxLayout>
+#include <QRegion>
 #include <QSignalMapper>
 #include <QTimer>
 
@@ -648,7 +649,12 @@ FullscreenControllerWidget::FullscreenControllerWidget( intf_thread_t *_p_i, QWi
 
     vout.clear();
 
+#ifdef Q_WS_X11
+    setWindowFlags( Qt::Window | Qt::FramelessWindowHint );
+    setWindowModality( Qt::ApplicationModal );
+#else
     setWindowFlags( Qt::ToolTip );
+#endif
     setMinimumWidth( 600 );
 
     setFrameShape( QFrame::StyledPanel );
@@ -747,6 +753,11 @@ void FullscreenControllerWidget::showFSC()
     setWindowOpacity( var_InheritFloat( p_intf, "qt-fs-opacity" )  );
 #endif
 
+#ifdef Q_WS_X11
+    // Tell kwin that we do not want a shadow around the fscontroller
+    setMask( QRegion( 0, 0, width(), height() ) );
+#endif
+
     show();
 }