gitk: Enable mouse horizontal scrolling in diff pane
Currently it's required to hold Shift and scroll up and down to move horizontally. Listen to Button-6 and Button-7 events too to make horizontal scrolling handier with touchpads and some mice. Signed-off-by: NGabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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