Before this change, certain shell quoting / escaping errors (particularly on
Windows) were not detected by Bisync, possibly resulting in incorrect expansion
and confusing errors. In particular, Windows paths with a single trailing
backslash followed by a quote would be interpreted as an escaped quote --
resulting in the quote and subsequent flags being erroneously considered part
of the path.
After this change, Bisync specifically checks for a few of the most common
patterns, and if detected, exits with a more helpful error message before doing
any damage.
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