Fix issues with GIF transparency#3434

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zewt wants to merge 13 commits intopython-pillow:masterfrom

zewt:gif-transparency

Commits on Mar 7, 2019

Add a test for an image that works with other GIF decoders.

zewt
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radarhere
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GIF: Support transparency in the native decoder.

zewt
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radarhere
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GIF: Handle GIF transparency in the decoder.

zewt
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radarhere
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GIF: Clear the buffer to the correct initial color before decoding frame 0.

zewt
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radarhere
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GIF: Clear to transparency rather than background if available.

zewt
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radarhere
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GIF: Fix the previous frame not always being decoded in _seek.

zewt
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radarhere
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Fix Flake8

hugovk
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radarhere
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Fix Flake8

hugovk
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radarhere
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Commits on Mar 15, 2019

Commits on Apr 2, 2021

Merge branch 'master' into gif-transparency
radarhere
committed

Commits on Apr 16, 2021

Merge branch 'master' into gif-transparency
radarhere
authored

Commits on Jun 25, 2021

Use context manager
radarhere
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