Pillow/docs/releasenotes/7.1.1.rst

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7.1.1
-----
Fix regression seeking PNG files
================================
This fixes a regression introduced in 7.1.0 when adding support for APNG files when calling
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``seek`` and ``tell``:
.. code-block:: pycon
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>>> from PIL import Image
>>> with Image.open("Tests/images/hopper.png") as im:
... im.seek(0)
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/PIL/PngImagePlugin.py", line 739, in seek
if not self._seek_check(frame):
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/PIL/ImageFile.py", line 306, in _seek_check
return self.tell() != frame
File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/PIL/PngImagePlugin.py", line 827, in tell
return self.__frame
AttributeError: 'PngImageFile' object has no attribute '_PngImageFile__frame'
>>>