gitk: Add Return and Escape bindings to dialogs
It is often more convenient to dismiss or accept a dialog using the keyboard, than by clicking buttons on the screen. This commit adds key binding to make it possible with gitk's dialogs. Signed-off-by: NAlexander Gavrilov <angavrilov@gmail.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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