Do not clear GIF tile when checking number of frames #6455
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Resolves #6454
When checking the number of frames, GifImagePlugin calls
_seek()with anupdate_imagevalue ofFalse. The idea is that the image does not need to be loaded, just the data read. This was added in #6077 for performance.It makes sense then, that the
tilevalue should also not be updated. This PR makes that change.Without this change, the issue found a situation where the image had not been loaded, and after checking whether or not the image was animated, there was no longer a tile to load image data from.