Re: [PATCH v3 0/2] apply: set file mode when --reverse creates a deleted file

> Changes from v2:
> * test_file_mode_common correctly fails when requested to verify the
>   presence of a file (by nonzero mode argument) that is actually absent.
> * Test setup establishes tags at appropriate checkpoints with git tag,
>   and tests restore those checkpoints with git reset --hard, making
>   tests less sensitive to execution order and to the success of previous
>   tests.
> * test_file_mode_common accepts full 6-digit file modes instead of
>   4-digit ones, and uses 000000 for absent files (as git diff --raw
>   does) instead of an empty string.
> * File presence is assured with >f as opposed to touch f. Minor style
> * fix at the point of test_file_mode_common's declaration.