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This allows the use of a "text-direction" hint set to one of "none", "rtl", or "ltr" to enforce the text direction of a "horizontal-buttons" display-hint. This is useful when a menu has buttons that map to physical space in the UI and therefore must match the application widgetry. https://bugzilla.gnome.org/show_bug.cgi?id=772775
17bcd0d1