Unpatched trunk built with GTK+ 3.10.6, Glib 2.38.2 does indeed fall back to (correct) Gnome icons for Undo/Redo (if the Gnome icon theme is installed), but still does not appear to be able to use the built-in ones (e.g. if the Gnome icon theme has been uninstalled).
Likely related upstream reports wrt icons with LTR/RTL variants: /bugzilla. gnome.org/ show_bug. cgi?id= 690563> /bugzilla. gnome.org/ show_bug. cgi?id= 702423>
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Unpatched trunk built with GTK+ 3.10.6, Glib 2.38.2 does indeed fall back to (correct) Gnome icons for Undo/Redo (if the Gnome icon theme is installed), but still does not appear to be able to use the built-in ones (e.g. if the Gnome icon theme has been uninstalled).