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8f74ac02ca
convert_regexp() needs to escape '(' and ')' in filenames taken from a
logfile to get rid of their special meaning, and to avoid a crash on
unbalanced parenthesis (which makes the regex invalid if they are not
escaped).
Note: The added tests include an example log line, but the tests itsself
don't/didn't trigger the crash because they don't call convert_regexp().
Fixes: https://bugs.launchpad.net/bugs/1835311