Add a post-release bugfix from upstream

debian/patches/Flush-drawable-surface-when-getting-a-pixbuf.patch

@@ -0,0 +1,26 @@
+From: Thomas Zajic <zlatko-github@zlatk0.net>
+Date: Wed, 17 Nov 2021 17:12:04 +0000
+Subject: Flush drawable surface when getting a pixbuf
+
+When getting the drawable surface to get its pixels we should be
+flushing the Cairo state, not mark it dirty.
+
+Bug: https://gitlab.gnome.org/GNOME/gtk/-/issues/4456
+Origin: upstream, 3.24.36, commit:e413f5c43259a22269aa1e75767dd545e10119b5
+---
+ gdk/gdkpixbuf-drawable.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/gdk/gdkpixbuf-drawable.c b/gdk/gdkpixbuf-drawable.c
+index 603c8ff..e63c3a8 100644
+--- a/gdk/gdkpixbuf-drawable.c
++++ b/gdk/gdkpixbuf-drawable.c
+@@ -104,7 +104,7 @@ gdk_pixbuf_get_from_window (GdkWindow *src,
+    * by external applications.
+    * So be on the safe side and:
+    */
+-  cairo_surface_mark_dirty (surface);
++  cairo_surface_flush (surface);
+ 
+   if (cairo_surface_get_content (surface) & CAIRO_CONTENT_ALPHA)
+     copy = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width * scale, height * scale);

debian/patches/series

@@ -1,4 +1,5 @@
 dist/Reinstate-gdk-wayland-cursor-meson.build.patch
+Flush-drawable-surface-when-getting-a-pixbuf.patch
 016_no_offscreen_widgets_grabbing.patch
 017_no_offscreen_device_grabbing.patch
 060_ignore-random-icons.patch