try workaround

Author: jcupitt

README.md

@@ -156,8 +156,8 @@ flatpak remote-add --if-not-exists \
 Install the gtk4 SDK and runtime:
 
 ```shell
-flatpak install org.gnome.Sdk//44
-flatpak install org.gnome.Platform//44
+flatpak install org.gnome.Sdk//45
+flatpak install org.gnome.Platform//45
 ```
 
 Allow file. Recent security changes to git will cause submodule checkout

org.libvips.vipsdisp.json

@@ -367,7 +367,7 @@
                 {
                     "type" : "git",
                     "url" : "https://github.com/libvips/libvips.git",
-                    "commit" : "baf3ac9b6151c961be00ff3c6cf8ad06b0305d31"
+                    "commit" : "db9c535a4a8d56bab564e12f7bc14db88e82a6f9"
                 }
             ]
         },
@@ -383,7 +383,7 @@
                 {
                     "type" : "git",
                     "url" : "https://github.com/jcupitt/vipsdisp.git",
-                    "tag" : "v2.7"
+                    "tag" : "v3.0a"
                 }
             ]
         }

src/imagewindow.c

@@ -174,6 +174,9 @@ image_window_active_remove(ImageWindow *win, const char *filename)
 	if (active->imageui == win->imageui)
 		win->imageui = NULL;
 
+	// many version of gtk hate removing a widget which has focus
+	gtk_widget_grab_focus(win->gears);
+
 	gtk_stack_remove(GTK_STACK(win->stack), GTK_WIDGET(active->imageui));
 	g_hash_table_remove(win->active_hash, filename);
 }