[gnome-documents] overview: Restore the accelerators for going back

[Debarshi Ray <debarshir src gnome org>]

commit a2ddf64d8907cdfc8f7cea051904846758cdd9bf
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu May 11 18:30:00 2017 +0200

    overview: Restore the accelerators for going back
    
    Fallout from ec8369e87be7888dbe28cc5ccfbb161b74e6f2c1
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782524

 src/overview.js |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/overview.js b/src/overview.js
index 8fd00a9..d11910e 100644
--- a/src/overview.js
+++ b/src/overview.js
@@ -1064,9 +1064,16 @@ const OverviewStack = new Lang.Class({
     },
 
     _getDefaultActions: function() {
+        let backAccels = ['Back'];
+        if (this.get_direction() == Gtk.TextDirection.LTR)
+            backAccels.push('<Alt>Left');
+        else
+            backAccels.push('<Alt>Right');
+
         return [
             { name: 'go-back',
-              callback: Lang.bind(this, this._goBack) },
+              callback: Lang.bind(this, this._goBack),
+              accels: backAccels },
             { name: 'selection-mode',
               callback: Utils.actionToggleCallback,
               state: GLib.Variant.new('b', false),