63faf4df6e174cc1e33a759d49133044c732ea32

If the user has created (or deleted) a branch through an external tool, and uses Rescan, they probably are trying to make git-gui update to show their newly created branch. So now we load all known heads and update the branch menu during any rescan operation, just in-case the set of known branches was modified. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
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