[PATCH 1/5] server: If the being validated region covers whole window then validate everything.

[Dmitry Timoshkov]

From: Dmitry Timoshkov

Signed-off-by: Dmitry Timoshkov 
---
 server/window.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/server/window.c b/server/window.c
index 242e93f303a..fc16acc1822 100644
--- a/server/window.c
+++ b/server/window.c
@@ -1530,7 +1530,17 @@ static void redraw_window( struct window *win, struct region *region, int frame,
         {
             if ((tmp = crop_region_to_win_rect( win, region, frame )))
             {
-                if (!subtract_region( tmp, win->update_region, tmp ))
+                rectangle_t rect = win->window_rect;
+
+                offset_rect( &rect, -rect.left, -rect.top );
+
+                /* region covers whole window: validate everything */
+                if (rect_in_region( tmp, &rect ))
+                {
+                    free_region( tmp );
+                    tmp = NULL;
+                }
+                else if (!subtract_region( tmp, win->update_region, tmp ))
                 {
                     free_region( tmp );
                     return;