Clear PPM half token after use #7052
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Resolves #6963
When PpmImagePlugin is reading an image, it only reads
ImageFile.SAFEBLOCKbytes at a time.So when looping through this data, if there is no space after the last digit, it saves this for the next loop, in case the read operation stopped partway through a series of digits.
Except that
half_tokenisn't cleared after it is used. That means that it keeps getting used, and so infinite data is available to fill the image size.This PR fixes that.