branchmap: explicitly warm+write all subsets of the branchmap caches 'full' claims it will warm all of the caches that are known about, but this was not the case - it did not actually warm the branchmap caches for subsets that we haven't requested, or for subsets that are still considered "valid". By explicitly writing them to disk, we can force the subsets for ex: "served" to be written ("immutable" and "base"), making it cheaper to calculate "served" the next time it needs to be updated. Differential Revision: https://phab.mercurial-scm.org/D6710

changectx: extract explicit computechangesetfilesremoved method from context Right now, the logic around changeset centric removed files data are buried into the "changectx" code. We extract this code in a dedicated method (in the scmutil module) for clarity. This clarity will help to explicitly compute and caches these data in the future.

changectx: extract explicit computechangesetfilesadded method from context Right now, the logic around changeset centric added files data are buried into the "changectx" code. We extract this code in a dedicated method (in the scmutil module) for clarity. This clarity will help to explicitly compute and caches these data in the future.