nix/xwayland-vsync.patch


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--- a/hw/xwayland/xwayland-present.c
+++ b/hw/xwayland/xwayland-present.c
@@ -824,7 +824,8 @@
         dixDestroyPixmap(vblank->pixmap, vblank->pixmap->drawable.id);
         vblank->pixmap = NULL;

-        if (xwl_present_queue_vblank(screen, window, vblank->crtc,
+        if (vblank->target_msc > crtc_msc &&
+            xwl_present_queue_vblank(screen, window, vblank->crtc,
                                      vblank->event_id, crtc_msc + 1)
             == Success)
             return;