Fix recovering from possible decompression error. Since
insert_from_gap doesn't always move point, we can't use PT as the position where the partially decompressed data ends, and should count how may bytes was produced so far. * decompress.c (struct decompress_unwind_data): Add nbytes member. (unwind_decompress): Really delete partially uncompressed data. (Fzlib_decompress_region): Take decompressed data size into account.
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