Crop the update region to the new window rectangle when resizing a
window.
diff --git a/server/window.c b/server/window.c
index 750b2b3..f1133ba 100644
--- a/server/window.c
+++ b/server/window.c
@@ -1164,6 +1164,24 @@
goto done;
}
+ /* crop update region to the new window rect */
+
+ if (win->update_region &&
+ (window_rect->right - window_rect->left < old_window_rect.right - old_window_rect.left ||
+ window_rect->bottom - window_rect->top < old_window_rect.bottom - old_window_rect.top))
+ {
+ struct region *tmp = create_empty_region();
+ if (tmp)
+ {
+ set_region_rect( tmp, window_rect );
+ offset_region( tmp, -window_rect->left, -window_rect->top );
+ if (intersect_region( tmp, win->update_region, tmp ))
+ set_update_region( win, tmp );
+ else
+ free_region( tmp );
+ }
+ }
+
if (swp_flags & SWP_NOREDRAW) goto done; /* do not repaint anything */
/* expose the whole non-client area if it changed in any way */
