comparison mercurial/copies.py @ 45985:b6b7626d3e06

copies: avoid unwanted side effect from one branch to another

Without this copy, change in a one descendant branch (With "remove" change
only) could affect computation on another descendant branches.

This was not caugh by the test because the test graph are "too simple". I
started writing more test in that regards, but I a submitting this changes
earlier because I want to get more code landed to allow other optimisation work
to happens.

Differential Revision: https://phab.mercurial-scm.org/D9416

45984:fada33872b5b

                    prev = copies.get(source)
                    if prev is not None and prev[1] is not None:
                        source = prev[1]
                    newcopies[dest] = (c, source)
                assert newcopies is not copies
            if changes is not None:
                for f in changes.removed:
                    if f in newcopies:
                        if newcopies is copies:
                            # copy on write to avoid affecting potential other
                            # branches.  when there are no other branches, this

45985:b6b7626d3e06

                    prev = copies.get(source)
                    if prev is not None and prev[1] is not None:
                        source = prev[1]
                    newcopies[dest] = (c, source)
                assert newcopies is not copies
            if changes is not None and changes.removed:
                if newcopies is copies:
                    newcopies = copies.copy()
                for f in changes.removed:
                    if f in newcopies:
                        if newcopies is copies:
                            # copy on write to avoid affecting potential other
                            # branches.  when there are no other branches, this