GdkWin32: Position popups on the primary monitor if outside of the visible screen...

Fixes a crash caused by attempting to dereference a NULL GdkMonitor*
in GdkWin32.

See https://gitlab.gnome.org/GNOME/gtk/-/issues/5125

diff --git a/gdk/win32/gdksurface-win32.c b/gdk/win32/gdksurface-win32.c
index 6fc15f38155712bcc8d283d1f41c9e6b16b16a18..a94e43b68dbbccf8c0ba81bfb19ddcc968f6a0fc 100644 (file)
--- a/gdk/win32/gdksurface-win32.c
+++ b/gdk/win32/gdksurface-win32.c
@@ -1180,6 +1180,11 @@ gdk_win32_surface_layout_popup (GdkSurface     *surface,
 
   monitor = gdk_surface_get_layout_monitor (surface, layout,
                                             gdk_win32_monitor_get_workarea);
+  if (!monitor)
+    {
+      GdkDisplay *display = gdk_surface_get_display (surface);
+      monitor = gdk_win32_display_get_primary_monitor (display);
+    }
   gdk_win32_monitor_get_workarea (monitor, &bounds);
 
   gdk_popup_layout_get_shadow_width (layout,