stack: show unstable state for the current revision if it is one (issue5553)
Before this patch if the current revision is unstable, hg stack does not show
the unstable state. This patch fixes that by showing both current and unstable
state for the current revision if that's unstable.
#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