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Hmm... it looks like mq_changed_files() duplicates a chunk of logic from
the existing changed_files() code. You can get rid of this redundancy by
replacing mq_changed_files() with a function that checks for applied MQ
patches; let's call it mq_patches_applied(). Then you can say:
 if mq_patches_applied():
 cmd += ' --rev qparent'
before the call to Popen in changed_files(), and leave the rest of the
function unmodified. The basic logic that the code will follow is this:
 if <MQ patches applied>:
 return files listed by 'hg status --added --modified --no-status --rev qparent'
 else:
 return files listed by 'hg status --added --modified --no-status'
The mq_patches_applied() function can be implemented by running
'hg qapplied' and checking whether it (a) prints at least one patch name,
(b) prints out nothing, or (c) gives an error.