Fixed ensuring that GIF previous frame was loaded #5386
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Resolves #4418. Takes a part of #3434
In
_seek()in GifImagePlugin,Pillow/src/PIL/GifImagePlugin.py
Lines 150 to 152 in e2ac1d1
self.imis onlyNonebefore the first frame is loaded. After that, there isself.im- the image at the time.So this current code only checks that the image has been loaded at some point in the past. It doesn't check that the previous frame was loaded.
Instead,
self.tilecan be used as an indicator if there is data waiting to be decoded.