[PATCH xserver] present/wnmd: Preserve window pixmap's screen_x/y on flip

[Michel Dänzer]

From: Michel Dänzer <michel.daenzer at amd.com>

The incorrect values could result in the new pixmap's contents
getting corrupted down the line.

Bugzilla: https://bugs.freedesktop.org/106841
Fixes: 029608dd8020 "present: Add window flip mode"
Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
---
 present/present_wnmd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/present/present_wnmd.c b/present/present_wnmd.c
index 80ffb014e..1e3958bfc 100644
--- a/present/present_wnmd.c
+++ b/present/present_wnmd.c
@@ -469,6 +469,8 @@ present_wnmd_execute(present_vblank_ptr vblank, uint64_t ust, uint64_t crtc_msc)
                 PixmapPtr old_pixmap = screen->GetWindowPixmap(window);
 
                 /* Replace window pixmap with flip pixmap */
+                vblank->pixmap->screen_x = old_pixmap->screen_x;
+                vblank->pixmap->screen_y = old_pixmap->screen_y;
                 present_set_tree_pixmap(toplvl_window, old_pixmap, vblank->pixmap);
                 vblank->pixmap->refcnt++;
                 dixDestroyPixmap(old_pixmap, old_pixmap->drawable.id);
-- 
2.17.1