[gtk+] ColorButton: Don’t destroy dialog @ ::delete-event

[Daniel Boles <dboles src gnome org>]

commit efaf99b039f3882157df67f714dfa5a7af46f2a2
Author: Hiroyuki Ito <ZXB01226 nifty com>
Date:   Mon Sep 11 12:02:13 2017 +0000

    ColorButton: Don’t destroy dialog @ ::delete-event
    
    Without specifically connecting ::delete-event to something, the dialog
    will be destroyed when it is closed, for example by pressing Esc. This
    meant that when dismissing it this way, unlike by pressing Cancel, any
    custom palette would be lost when the dialog was next opened, and so on.
    
    Resolve this by making ::delete-event just do GTK_RESPONSE_CANCEL, so
    closing the dialog has the same effect as clicking its Cancel button.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787444

 gtk/gtkcolorbutton.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcolorbutton.c b/gtk/gtkcolorbutton.c
index b844d51..e583cda 100644
--- a/gtk/gtkcolorbutton.c
+++ b/gtk/gtkcolorbutton.c
@@ -490,6 +490,16 @@ gtk_color_button_new_with_rgba (const GdkRGBA *rgba)
 }
 
 static gboolean
+dialog_delete_event (GtkWidget *dialog,
+                     GdkEvent  *event,
+                     gpointer   user_data)
+{
+  g_signal_emit_by_name (dialog, "response", GTK_RESPONSE_CANCEL);
+
+  return TRUE;
+}
+
+static gboolean
 dialog_destroy (GtkWidget *widget,
                 gpointer   data)
 {
@@ -554,6 +564,8 @@ ensure_dialog (GtkColorButton *button)
                     G_CALLBACK (dialog_response), button);
   g_signal_connect (dialog, "destroy",
                     G_CALLBACK (dialog_destroy), button);
+  g_signal_connect (dialog, "delete-event",
+                    G_CALLBACK (dialog_delete_event), button);
 }