gitk: moving all three panes if clicking on an arrow.
gitk: moving all three panes if clicking on an arrow.

Signed-off-by: Stefan-W. Hahn <05a4913192cf7043adae268290b48dbb824dde7e@s-hahn.de>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git