undumprevlog: update to valid Python 3 syntax I didn't do anything to ensure correctness here, just enough to avoid tracebacks in the import checker, which uses the native ast module to try and parse all our Python files.

tests: fixed a bytes/unicode confusion in the test runner Differential Revision: https://phab.mercurial-scm.org/D483

run-tests: remove unused pygments token type Differential Revision: https://phab.mercurial-scm.org/D478

run-tests: also highlight .py test files in summary messages With the .t files highlighted, it's very easy to not even notice failed .py tests. Differential Revision: https://phab.mercurial-scm.org/D471

test-revset: make it work with chg chg currently triggers `reposetup` as a side effect of `hg serve` command. Therefore change the test to not output during `reposetup` to be compatible with chg. Differential Revision: https://phab.mercurial-scm.org/D455

copies: use intersectmatchers() in non-merge p1 optimization This enables the optimization introduced by d4247c306d82 for non-rebase cases. Before, the match couldn't be narrowed if it was e.g. alwaysmatcher. The logic is copied from bd56bea5ecf8.

run-tests: pre instantiate pygments objects Pre instantiate pygments objects to minimize overhead (cf. 20436925e080)