gitk: Add support for OS X mouse wheel
(Väinö Järvelä supplied this patch a while ago for 1.5.2. It no longer applied cleanly, so I'm reposting it.) MacBook doesn't seem to recognize MouseRelease-4 and -5 events, at all. So i added a support for the MouseWheel event, which i limited to Tcl/tk aqua, as i couldn't test it neither on Linux or Windows. Tcl/tk needs to be updated from the version that is shipped with OS X 10.4 Tiger, for this patch to work. Signed-off-by: NJonathan del Strother <jon.delStrother@bestbefore.tv> Signed-off-by: NShawn O. Pearce <spearce@spearce.org>
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