[geary] Fix the Detach shortcut not working. Bug 773658.

[Niels De Graef <nielsdg src gnome org>]

commit 0ea634c30f79985ac871f1116ce3569483adcf12
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Mon Dec 12 12:20:08 2016 +0100

    Fix the Detach shortcut not working. Bug 773658.

 src/client/composer/composer-widget.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/client/composer/composer-widget.vala b/src/client/composer/composer-widget.vala
index 9f64f9a..81bc7e1 100644
--- a/src/client/composer/composer-widget.vala
+++ b/src/client/composer/composer-widget.vala
@@ -140,6 +140,7 @@ public class ComposerWidget : Gtk.EventBox {
         action_accelerators.set(ACTION_CLOSE, "<Ctrl>w");
         action_accelerators.set(ACTION_CLOSE, "Escape");
         action_accelerators.set(ACTION_ADD_ATTACHMENT, "<Ctrl>t");
+        action_accelerators.set(ACTION_DETACH, "<Ctrl>d");
     }
 
     private const string DRAFT_SAVED_TEXT = _("Saved");