[geary: 1/2] Added detach composer shortcut to UI

[Michael Gratton <mjog src gnome org>]

commit 4ca4a91bbc70d4dfafbb58a8b8e39a35345504b5
Author: hkdb <hkdb 3df io>
Date:   Tue Jul 7 21:13:20 2020 +0800

    Added detach composer shortcut to UI
    
    Added "Detach composer" shortcut to "Keyboard Shortcuts" window
    under the "Actions" section of the "Composer Shortcuts" page in the UI.

 ui/gtk/help-overlay.ui | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/ui/gtk/help-overlay.ui b/ui/gtk/help-overlay.ui
index c0c664612..951db785f 100644
--- a/ui/gtk/help-overlay.ui
+++ b/ui/gtk/help-overlay.ui
@@ -389,6 +389,13 @@
                                 <property name="accelerator">&lt;primary&gt;T</property>
                             </object>
                         </child>
+                        <child>
+                            <object class="GtkShortcutsShortcut">
+                                <property name="visible">True</property>
+                                <property name="title" translatable="yes" context="shortcut window">Detach 
the composer</property>
+                                <property name="accelerator">&lt;primary&gt;D</property>
+                            </object>
+                        </child>
                     </object>
                 </child>
                 <child>