[gnome-shell] extensionsService: Fix setting prefs dialog parent

[Marge Bot <marge-bot src gnome org>]

commit a32df6b7a3853f9e254d5fa9b1748608354ec070
Author: Florian Müllner <fmuellner gnome org>
Date:   Sat Jan 16 01:43:53 2021 +0100

    extensionsService: Fix setting prefs dialog parent
    
    Between the GTK4 port and the latest GTK4 version, calling realize()
    on a newly created window to force its surface to be created stopped
    working.
    
    So instead, wait for the window to get realized regularly to set its
    parent.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1574>

 js/dbusServices/extensions/extensionsService.js | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/js/dbusServices/extensions/extensionsService.js b/js/dbusServices/extensions/extensionsService.js
index 8217675b0c..35e7805785 100644
--- a/js/dbusServices/extensions/extensionsService.js
+++ b/js/dbusServices/extensions/extensionsService.js
@@ -120,15 +120,15 @@ var ExtensionsService = class extends ServiceImplementation {
             const extension = ExtensionUtils.deserializeExtension(serialized);
 
             const window = new ExtensionPrefsDialog(extension);
-            window.realize();
+            window.connect('realize', () => {
+                let externalWindow = null;
 
-            let externalWindow = null;
+                if (parentWindow)
+                    externalWindow = Shew.ExternalWindow.new_from_handle(parentWindow);
 
-            if (parentWindow)
-                externalWindow = Shew.ExternalWindow.new_from_handle(parentWindow);
-
-            if (externalWindow)
-                externalWindow.set_parent_of(window.get_surface());
+                if (externalWindow)
+                    externalWindow.set_parent_of(window.get_surface());
+            });
 
             if (options.modal)
                 window.modal = options.modal.get_boolean();