[gimp] gimptextstyleeditor: Fix crash on exit

[Jehan <jehanp src gnome org>]

commit e41250394dc619f907306d5087e07b4fa0175963
Author: Lukas Oberhuber <lukaso gmail com>
Date:   Wed Dec 22 12:58:32 2021 +0000

    gimptextstyleeditor: Fix crash on exit
    
    Messages were being sent to editor after editor had been destroyed. This
    stops that.

 app/widgets/gimptextstyleeditor.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/app/widgets/gimptextstyleeditor.c b/app/widgets/gimptextstyleeditor.c
index 13e8462496..7f0a542305 100644
--- a/app/widgets/gimptextstyleeditor.c
+++ b/app/widgets/gimptextstyleeditor.c
@@ -391,6 +391,13 @@ gimp_text_style_editor_dispose (GObject *object)
                                             editor);
     }
 
+  if (editor->context)
+    {
+      g_signal_handlers_disconnect_by_func (editor->context,
+                                            gimp_text_style_editor_font_changed,
+                                            editor);
+    }
+
   if (editor->update_idle_id)
     {
       g_source_remove (editor->update_idle_id);