[gimp/wip/Jehan/issue-8518-welcome-dialog-macos] Issue #8518: Could not close new Welcome dialog.

[Jehan <jehanp src gnome org>]

commit d505b3d25c6f22569eeb7852a08a4db162b0fab1
Author: Jehan <jehan girinstud io>
Date:   Sat Sep 10 23:56:56 2022 +0200

    Issue #8518: Could not close new Welcome dialog.
    
    I can't reproduce this on Linux and according to docs and tests, the
    "response" signal handles the delete-event.
    But maybe there is a bug on macOS where it is not triggered when
    clicking the window button?
    
    THIS IS A TEST COMMIT, DO NOT PUSH AS-IS!

 app/dialogs/welcome-dialog.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)
---
diff --git a/app/dialogs/welcome-dialog.c b/app/dialogs/welcome-dialog.c
index 94b626adf7..853e4ea68b 100644
--- a/app/dialogs/welcome-dialog.c
+++ b/app/dialogs/welcome-dialog.c
@@ -55,6 +55,21 @@ static void   welcome_size_allocate                 (GtkWidget      *welcome_dia
                                                      GtkAllocation  *allocation,
                                                      gpointer        user_data);
 
+static gboolean
+on_delete (GtkWidget* self)
+{
+  printf("%s\n", G_STRFUNC);
+  gtk_widget_destroy (self);
+  return FALSE;
+}
+
+static gboolean
+on_response (GtkWidget* self)
+{
+  printf("%s\n", G_STRFUNC);
+  gtk_widget_destroy (self);
+  return FALSE;
+}
 
 GtkWidget *
 welcome_dialog_create (Gimp *gimp)
@@ -96,7 +111,11 @@ welcome_dialog_create (Gimp *gimp)
 
   g_signal_connect (welcome_dialog,
                     "response",
-                    G_CALLBACK (gtk_widget_destroy),
+                    G_CALLBACK (on_response),
+                    NULL);
+  g_signal_connect (welcome_dialog,
+                    "delete-event",
+                    G_CALLBACK (on_delete),
                     NULL);
 
   main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);