zzogl: flush instead of sync to be sure the size is correct

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@3753 96395faa-99c1-11dd-bbfe-3dabce05a288

plugins/zzogl-pg/opengl/GLWinX11.cpp

@@ -227,7 +227,8 @@ void GLWindow::ToggleFullscreen()
     XUnlockDisplay(glDisplay);
 
     // Apply the change
-    XSync(glDisplay, False);
+    // Note: Xsync is not enough. All pending event must be flush.
+    XFlush(glDisplay);
 
     // update info structure
     GetWindowSize();