[gtk/gtk-4-6: 1/3] surface/wayland: Handle no current monitor when calculating bounds

[Matthias Clasen <matthiasc src gnome org>]

commit 0b312d878ca464eab3311b1335a44d14ede6d436
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Sep 30 09:30:30 2022 +0200

    surface/wayland: Handle no current monitor when calculating bounds
    
    We shouldn't assume there is always a monitor to derive bounds from.
    If there is no monitor, pass empty bounds, as this matches what
    xdg_toplevel.configure_bounds do in this case.
    
    (cherry picked from commit 148c1336745a043a9660da6c4734ed905c628130)

 gdk/wayland/gdksurface-wayland.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)
---
diff --git a/gdk/wayland/gdksurface-wayland.c b/gdk/wayland/gdksurface-wayland.c
index 0b3315075e..f7c98b5e20 100644
--- a/gdk/wayland/gdksurface-wayland.c
+++ b/gdk/wayland/gdksurface-wayland.c
@@ -1395,7 +1395,6 @@ configure_toplevel_geometry (GdkSurface *surface)
   GdkWaylandSurface *impl = GDK_WAYLAND_SURFACE (surface);
   GdkDisplay *display = gdk_surface_get_display (surface);
   GdkMonitor *monitor;
-  GdkRectangle monitor_geometry;
   int bounds_width, bounds_height;
   GdkToplevelSize size;
   GdkToplevelLayout *layout;
@@ -1403,10 +1402,20 @@ configure_toplevel_geometry (GdkSurface *surface)
   GdkSurfaceHints mask;
 
   monitor = g_list_model_get_item (gdk_display_get_monitors (display), 0);
-  gdk_monitor_get_geometry (monitor, &monitor_geometry);
-  g_object_unref (monitor);
-  bounds_width = monitor_geometry.width;
-  bounds_height = monitor_geometry.height;
+  if (monitor)
+    {
+      GdkRectangle monitor_geometry;
+
+      gdk_monitor_get_geometry (monitor, &monitor_geometry);
+      g_object_unref (monitor);
+      bounds_width = monitor_geometry.width;
+      bounds_height = monitor_geometry.height;
+    }
+  else
+    {
+      bounds_width = 0;
+      bounds_height = 0;
+    }
 
   gdk_toplevel_size_init (&size, bounds_width, bounds_height);
   gdk_toplevel_notify_compute_size (GDK_TOPLEVEL (surface), &size);