[gnome-builder] gui: add shortcut entry for completion opacity toggle

[Christian Hergert <chergert src gnome org>]

commit a7afb33fb695071af0679a6b50fee342d04e8c30
Author: Christian Hergert <chergert redhat com>
Date:   Thu Mar 28 13:59:56 2019 -0700

    gui: add shortcut entry for completion opacity toggle

 src/libide/gui/ide-shortcuts-window.ui | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/libide/gui/ide-shortcuts-window.ui b/src/libide/gui/ide-shortcuts-window.ui
index e0abc881d..2158f0062 100644
--- a/src/libide/gui/ide-shortcuts-window.ui
+++ b/src/libide/gui/ide-shortcuts-window.ui
@@ -306,6 +306,13 @@
                 <property name="title" translatable="yes" context="shortcut window">Show completion 
window</property>
               </object>
             </child>
+            <child>
+              <object class="GtkShortcutsShortcut">
+                <property name="visible">true</property>
+                <property name="accelerator">&lt;ctrl&gt;</property>
+                <property name="title" translatable="yes" context="shortcut window">Toggle opacity of 
completion window</property>
+              </object>
+            </child>
             <child>
               <object class="GtkShortcutsShortcut">
                 <property name="visible">true</property>