Nux is missing right-to-left mirorring support

For languages that are written from right-to-left, such as Hebrew and Arabic, it is common to mirror the entire desktop UI, so that UI elements that were at the left side of the screen are now to the right, and vice versa. You can read more about that at Ubuntu RTL Team wiki page [1].

Other toolkits, such as Qt and Gtk support such mirroring using APIs such as gtk_widget_set_direction [2], or QWidget::setLayoutDirection [3]. Therefore, the first step for making the Unity desktop support right-to-left languages [4] should be adding such support to Nux.

In order to facilitate discussion on the design of this feature, I've created a small program that mimics Gnome's thewidgetfactory (twf) program, but running with Nux instead [5]. It tries to show all of Nux widgets in a single window. I will attach screenshots with and without RTL mirroring, and hopefully Ubuntu designers can discuss here how they would like this feature to work. This right to left screenshots are based on my patches [6] for Nux that was rejected before the precise release.

[1] Ubuntu RTL Team wiki page https://wiki.ubuntu.com/RTLTeam
[2] Gtk's gtk_widget_set_direction API http://www.gtk.org/api/2.6/gtk/GtkWidget.html#gtk-widget-set-direction
[3] Qt's QWidget::setLayoutDirection API http://doc.qt.nokia.com/4.7-snapshot/qwidget.html#layoutDirection-prop
[4] Unity bug #654988: Unity doesn't mirror its interface for RTL locales
[5] A widget factory program for Nux lp:~haggai-eran/nuxcodesamples/widgetfactory
[6] Nux RTL support branch lp:~haggai-eran/nux/rtl-logical-packing