phase: attach phase to the transaction instead of the lock The phase cache file is no longer written on lock release, it is now handled by the transaction (as changesets and obsolescence markers are). (Hooray) As we stop relying on the lock to write phase, repos with no existing phase information will need to wait for a phase move or a strip to happen in order to get the first write in the `phaseroots` file. This explain the change in test-inherit-mode.t. This should not have any side effects but in very obscure cases where people interact with pre-2.1 and post-2.1 versions of Mercurial on the same repo while having MQ patches applied but the MQ extension disabled from time to time. A case unlikely enough to not be worth preserving the old behavior with awful hacks.