[gnome-boxes] Add Ctrl-Q keyboard shortcut

[Alexander Larsson <alexl src gnome org>]

commit 4c51d6e390127ddb3b2ac357305722c4dcbc57f7
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Sep 28 11:02:25 2012 +0200

    Add Ctrl-Q keyboard shortcut
    
    We can't use accelerators for this as they would override the
    VM keyboard input, so we handle this in the GtkWindow key-pressed
    handler.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=683963

 src/app.vala |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/app.vala b/src/app.vala
index 6324f39..961deaf 100644
--- a/src/app.vala
+++ b/src/app.vala
@@ -671,6 +671,10 @@ private class Boxes.App: Boxes.UI {
         } else if (event.keyval == Gdk.Key.Escape) {
             if (selection_mode && ui_state == UIState.COLLECTION)
                selection_mode = false;
+        } else if (event.keyval == Gdk.Key.q &&
+                   (event.state & Gdk.ModifierType.MODIFIER_MASK) == Gdk.ModifierType.CONTROL_MASK) {
+            quit ();
+            return true;
         }
 
         return false;