view CONTRIBUTING @ 31261:bd884ef2ee46

context: remove uses of manifest.matches

This removes the uses of manifest.matches in context.py in favor of the new
manifest.diff(match) api. This is part of removing manifest.matches since it is
O(manifest).

To drop the dependency on ctx._manifestmatches(s) we transfer responsibilty for
creating status oriented manifests over to ctx._buildstatusmanifest(s). This
already existed for workingctx, we just need to implement a simple version for
basectx. The old _manifestmatches functionality is basically identical to the
_buildstatusmanifest functionality (minus the matching part), so no behavior
should be lost.

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