[issue22663] patchcheck alters content of .png files

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4d53b34dd493 by Georg Brandl in branch '2.7':
Closes #22663: patchcheck: only modify text files under Doc/
https://hg.python.org/cpython/rev/4d53b34dd493

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<http://bugs.python.org/issue22663>
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