Fix Ctrl+C out of IPython on GTK4.

QuLogic · QuLogic · commit 04f17f8c91f7 · 2021-09-01T15:23:19.000-04:00
The `Gtk.Window.destroy` doesn't work, but `.close` correctly triggers
our cleanup.
diff --git a/lib/matplotlib/backends/_backend_gtk.py b/lib/matplotlib/backends/_backend_gtk.py
@@ -28,7 +28,7 @@ def _shutdown_application(app):
     # The application might prematurely shut down if Ctrl-C'd out of IPython,
     # so close all windows.
     for win in app.get_windows():
-        win.destroy()
+        win.close()
     # The PyGObject wrapper incorrectly thinks that None is not allowed, or we
     # would call this:
     # Gio.Application.set_default(None)
