Commit 8acd000280 for qemu.org

commit 8acd000280df0e02182a45e26db979c5faf49366
Author: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Date:   Wed Mar 4 16:50:25 2026 +0000

    ui/gtk: Don't disable scanout when display is refreshed

    Display refreshment is invoked by a timer and it erroneously disables
    the active scanout if it happens to be invoked after scanout has been
    enabled. This offending scanout-disable race condition with a timer
    can be easily hit when Qemu runs with a disabled vsync by using SDL or
    GTK displays (with vblank_mode=0 for GTK). Refreshment of display's
    content shouldn't disable the active display. Fix it by keeping the
    scanout's state unchanged when display is redrawn.

    Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
    Acked-by: Michael S. Tsirkin <mst@redhat.com>
    Tested-by: Alex Bennée <alex.bennee@linaro.org>
    Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
    Reviewed-by: Yiwei Zhang <zzyiwei@gmail.com>
    Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
    Message-ID: <20260303151422.977399-2-dmitry.osipenko@collabora.com>
    Message-ID: <20260304165043.1437519-4-alex.bennee@linaro.org>
    Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

diff --git a/ui/gtk-egl.c b/ui/gtk-egl.c
index ae9239999c..0dbb429958 100644
--- a/ui/gtk-egl.c
+++ b/ui/gtk-egl.c
@@ -180,7 +180,6 @@ void gd_egl_refresh(DisplayChangeListener *dcl)

     if (vc->gfx.glupdates) {
         vc->gfx.glupdates = 0;
-        gtk_egl_set_scanout_mode(vc, false);
         gd_egl_draw(vc);
     }
 }
diff --git a/ui/gtk-gl-area.c b/ui/gtk-gl-area.c
index cd86022d26..c709b2ce0f 100644
--- a/ui/gtk-gl-area.c
+++ b/ui/gtk-gl-area.c
@@ -199,7 +199,6 @@ void gd_gl_area_refresh(DisplayChangeListener *dcl)

     if (vc->gfx.glupdates) {
         vc->gfx.glupdates = 0;
-        gtk_gl_area_set_scanout_mode(vc, false);
         gtk_gl_area_queue_render(GTK_GL_AREA(vc->gfx.drawing_area));
     }
 }