tdf#158461 eliminate flicker during live resizing

When using Skia/Metal, the window content will flicker while
live resizing a window if we don't send a paint event.

Change-Id: Ib3edc497e26e6abfdfd17a34f9269a3eae090805
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160519
Tested-by: Jenkins
Reviewed-by: Patrick Luby <plubius@libreoffice.org>

vcl/osx/salframeview.mm

@@ -465,8 +465,12 @@ static void updateWinDataInLiveResize(bool bInLiveResize)
         else
         {
             [self clearLiveResizeTimer];
-            mpFrame->SendPaintEvent();
         }
+
+        // tdf#158461 eliminate flicker during live resizing
+        // When using Skia/Metal, the window content will flicker while
+        // live resizing a window if we don't send a paint event.
+        mpFrame->SendPaintEvent();
     }
 
     mbInWindowDidResize = NO;