macosx: don't allow a automatic resize beyond the right screen border

(cherry picked from commit 4b40a27d)
Signed-off-by: David Fuhrmann <david.fuhrmann@googlemail.com>

modules/gui/macosx/MainWindow.m

@@ -1666,6 +1666,11 @@ static VLCMainWindow *_o_sharedInstance = nil;
     if( new_frame.origin.y < screenFrame.origin.y )
         new_frame.origin.y = screenFrame.origin.y;
 
+    CGFloat right_screen_point = screenFrame.origin.x + screenFrame.size.width;
+    CGFloat right_window_point = new_frame.origin.x + new_frame.size.width;
+    if( right_window_point > right_screen_point )
+        new_frame.origin.x -= ( right_window_point - right_screen_point );
+
     [[o_videoWindow animator] setFrame:new_frame display:YES];
 }