flags: also test merging a rename with and exec flag change
This case is currently buggy and was not tested. This is probably a quite old
regression. The next changeset fix this case. Move exec+rename related bug will
gain a test later.
To highlight the expected behavior the currently missing line are marked with (false !)
and the bad one with (true !)
note: we should probably gain explicit "test bool" for this usecases.
Differential Revision: https://phab.mercurial-scm.org/D8530
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