[gimp] app: in gimp_accel_label_set_action(), emit notify

[Ell <ell src gnome org>]

commit 0ac2aa51307c64d415fe253a8f55f56a81319a4a
Author: Ell <ell_se yahoo com>
Date:   Tue Jun 2 11:02:19 2020 +0300

    app: in gimp_accel_label_set_action(), emit notify

 app/widgets/gimpaccellabel.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/app/widgets/gimpaccellabel.c b/app/widgets/gimpaccellabel.c
index 6f1c0c0f9a..cd97206608 100644
--- a/app/widgets/gimpaccellabel.c
+++ b/app/widgets/gimpaccellabel.c
@@ -271,6 +271,8 @@ gimp_accel_label_set_action (GimpAccelLabel *accel_label,
         }
 
       gimp_accel_label_update (accel_label);
+
+      g_object_notify (G_OBJECT (accel_label), "action");
     }
 }