prev: prompt user to choose parent in case of multiple parents
This patch adds functionality to `hg prev` to prompt user to choose one parent
to update when multiple parents exist.
Surprisingly there were no tests for this case before this patch, I added one
with this patch.
#require test-repo pyflakes
Copied from Mercurial core (60ee2593a270)
$ cd "`dirname "$TESTDIR"`"
run pyflakes on all tracked files ending in .py or without a file ending
(skipping binary file random-seed)
$ hg locate 'set:(**.py or grep("^#!.*python")) - removed()' 2>/dev/null \
> | xargs pyflakes 2>/dev/null