(compilation-buffer-p): Move defsubst before all callers.
(compilation-forget-errors): Reset compilation-parsing-end to 1 here. (compile-reinitialize-errors): Don't reset compilation-parsing-end after calling compilation-forget-errors. Comment out gratuitous switch-to-buffer call; what was the rationale for it? Don't check compilation-parsing-end (removed local AT-START); instead always append to compilation-old-error-list, it will be nil if at start. If compilation-error-list is non-nil before calling the parser, restore its previous value afterwards; it still indicates the current error position. Subtract the length of the existing compilation-error-list from FIND-AT-LEAST when calling the parser. (compilation-parse-errors): Don't check LIMIT-SEARCH at end of loop. Inside check it inside each case of the cond; in error case we must discard the last new error before stopping (just as for FIND-AT-LEAST). Use floating-point in buffer percentage calculation, to avoid integer overflow.
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