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Sometimes meld may be ran in a directory that contains invalid or corrupt version control information. (eg run 'mkdir .svn; meld .' in a git repository). Previously meld would not gracefully handle invalid repositories. This patch attempts to add a quick sanity check to most version control systems. The checks are meant to be as quick as possible to reduce startup time. Signed-off-by: Peter Tyser <ptyser@gmail.com>
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