[3.7] bpo-23205: IDLE: Add tests and refactor grep's findfiles (GH-12203) by miss-islington · Pull Request #12512 · python/cpython

@csabella @miss-islington

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* Add tests for grep findfiles.
* Move findfiles to module function.
* Change findfiles to use os.walk.

Based on a patch by Al Sweigart.
(cherry picked from commit d60f658)

Co-authored-by: Cheryl Sabella <cheryl.sabella@gmail.com>

csabella