clonebundles: document REQUIREDRAM key This is a follow-up to 72feaeb510b3, which introduced the feature. The key should be documented as part of the format specification inside the extension docstring. Differential Revision: https://phab.mercurial-scm.org/D8838

commitctx: gather more code dealing with copy-in-extra Now that we have a function that deal with the copy-in-extra special case, we can gather more code meant to deal with this special case. Making the rest of the code simpler.

commitctx: rename files to touched in a couple of place This is a clearer word that we will use increasingly over this series. It also make the old variable name available to another usage :-)

commitctx: extract copy information encoding into extra into commit.py The encoding of copy information into extra has multiple subcases and become quite complicated (eg: empty list can be explicitly or implicitly stored for example). In addition, it is niche experimental feature since as it affect the hash, it is only suitable for user who don't mercurial for storage server side (ie: Google). Having this complexity part of the changelog will get in the way of further cleanup. We could have to either move more of that logic into the changelog or to move or extract more of the logic at the higher level. We take the second approach and start gather logic in dedicated function in commit.py.

commitctx: create the new extra dict on its own line A trivial move to make the next changeset easier to read.

commitctx: explicitly pass `manifest` to _commit_manifest As pointed out by Yuya Nishihara.