Sets the reading direction for rendering purposes.
If you are using a #GtkStyleContext returned from gtk.widget.Widget.getStyleContext, you do not need to call this yourself.
the new direction.
Deprecated: Use gtk.style_context.StyleContext.setState with #GTK_STATE_FLAG_DIR_LTR and #GTK_STATE_FLAG_DIR_RTL instead.
Sets the reading direction for rendering purposes.
If you are using a #GtkStyleContext returned from gtk.widget.Widget.getStyleContext, you do not need to call this yourself.