Add functions for handling accelerators that use the Tab key
GTK+ does not allow the use of the Tab key as an accelerator. xfce_gtk_handle_tab_accels
and xfce_gtk_execute_tab_accel
can
be used to manually trigger the callback of an action that uses the Tab key as an accelerator.
Relevant: thunar!176 (merged)
This will also be used by xfce4-terminal
.