run-tests: pre instantiate pygments objects
Pre instantiate pygments objects to minimize overhead (cf.
20436925e080)
rebase: only change self.state when collapsing in _finishrebase
When the code executes to _finishrebase, self.state should be populated with
correct destinations and do not need to be written to a node. The code was
introduced by
8dc45c9059, which seems to avoid setting state values to None
but it didn't provide more details.
Differential Revision: https://phab.mercurial-scm.org/D346