gitk: Ensure that "Reset branch" menu entry is enabled
Consider this sequence of events: 1. Detach HEAD and fire up gitk 2. Call the context menu on some commit. Notice that the last menu entry says "Detached HEAD: can't reset" and it is disabled. 3. Now checkout some regular branch (e.g. 'master') using the context menu. 4. Call the context menu again on some commit. Previously, at this point the last menu entry said "Reset master branch to here", but it was still disabled. With this fix it is now enabled again. Signed-off-by: NJohannes Sixt <j6t@kdbg.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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