keyboard: Enforce LTR layout for keyboard layout

The onscreen keyboard should not follow the locale's text direction,
but order keys according to the selected keyboard layout. Effectively
this means enforcing LTR on the keyboard actor.

https://bugzilla.gnome.org/show_bug.cgi?id=672024

js/ui/keyboard.js

@@ -269,6 +269,11 @@ const Keyboard = new Lang.Class({
 
         this._addKeys();
 
+        // Keys should be layout according to the group, not the
+        // locale; as Caribou already provides the expected layout,
+        // this means enforcing LTR for all locales.
+        this.actor.text_direction = Clutter.TextDirection.LTR;
+
         this._keyboardNotifyId = this._keyboard.connect('notify::active-group', Lang.bind(this, this._onGroupChanged));
         this._focusNotifyId = global.stage.connect('notify::key-focus', Lang.bind(this, this._onKeyFocusChanged));