[polari] app: Force dispose when removing window

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

commit 3fa3eb96fa5cd71ccb4e810f4e602fdaaf79d0aa
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Jul 26 21:05:44 2021 +0200

    app: Force dispose when removing window
    
    In GTK4, gtk_window_destroy() will only release the reference
    held by GTK itself, which isn't necessarily enough to dispose
    the window (and thus emit the ::destroy signal).
    
    That's particularly true for language bindings, so help out with
    an explicit run_dispose() call.
    
    Part-of: <https://gitlab.gnome.org/GNOME/polari/-/merge_requests/230>

 src/application.js | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/application.js b/src/application.js
index 37190dd1..2bcd5d9d 100644
--- a/src/application.js
+++ b/src/application.js
@@ -446,6 +446,8 @@ export default GObject.registerClass({
 
         this._toplevelSignals.forEach(id => window.disconnect(id));
         this._toplevelSignals = [];
+
+        window.run_dispose();
     }
 
     vfunc_open(files) {