largefiles: fix check that ensures that --all-largefiles is only used locally Previously, the command added in the test failed with “abort: --all-largefiles is incompatible with non-local destination existing_destination”. The reason for the buggy behavior was the use of hg.islocal(), which does “return true if repo (or path pointing to repo) is local” and, for local paths, assumes that the path is actually pointing to an existing repository and returns whether the path is not a regular file (in which case it assumes that it is a bundlerepo, which are considered non-local).

exchange: trivial simplification Both sides of the condition do essentially the same thing, except one with fastpath=True. No functional changes.

import: fix erroneous comparison of str with bytes

histedit: create state and acquire locks earlier This makes chistedit (histedit with curses UI) not write any files inside repo without wlock. It also makes sense to wrap the entire process of preparing commands inside the curses UI inside locks because we don't want anything else to touch wdir or repo during this time.