[Updated] D12138: branchmap: split a long condition in branchcache.validfor(), add comments

[Alphare (Raphaël Gomès)]

This revision is now accepted and ready to land.
Alphare accepted this revision.

REPOSITORY
  rHG Mercurial

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D12138/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D12138

To: av6, #hg-reviewers, Alphare
Cc: mercurial-patches
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