narrow: detect if narrowspec was changed in a different share
With this commit, hg share should be usable with narrow
repos. Design explained on
I was running into cache invalidation problems when updating the
narrowspec. After spending a day trying to figure out a good solution,
I resorted to just assigning repo.narrowpats and repo._narrowmatch
after invalidating them.
Differential Revision: https://phab.mercurial-scm.org/D5278