Merge branch 'mm/revision-pure-get-commit-action' into jch

The get_commit_action() function has been refactored to be a pure
predicate by moving the side-effecting line-level log range folding to
simplify_commit().  This ensures that evaluating a commit's action
before the walk reaches it does not prematurely mutate its tracked
line ranges, making it safer for potential lookahead evaluations.

* mm/revision-pure-get-commit-action:
  revision: make get_commit_action() a pure predicate

diff --cc revision.c
Simple merge

diff --cc t/t4211-line-log.sh
Simple merge