doc: make gendoc.py module import policy aware Without this, running gendoc.py during an install without C modules available (via `make local`) will result in an import failure because the default module load policy insists on C modules. We also remove the sys.path adjustment because it is no longer needed since our magic importer handles things.

merge with stable

check-commit: add a test for the patch checking script in contrib This introduces a test for the change introduced in 8f5735b4aca5.

match: use re2 in readpatternfile if possible This has a small, but measurable, effect on performance if a pattern file is very large. In an artificial test with 200,000 lines of pattern data, using re2 reduced read time by 200 milliseconds.

test-hgignore.t: add tests for comments Although support for comments in hgignore files has existed for a while, it was previously untested.

help: fix help -c/help -e/help -k Before, hg help -c was the same as hg help, now it only shows commands. Before, hg help -e was the same as hg help, now it only shows extensions. Before, hg help -k crashed, now it shows all topics.

help: call filtercmd from topicmatch update test coverage to explicitly define when help -c should list debug/deprecated items.

help: refactor filtercmd

transplant: use Oxford comma

crecord: add dictionary to default return value of filterpatch When committing interactively without changes, the user would get a ValueError exception. This patch adds a dictionary to the return value of filterpatch when there are no files to change.