* lisp/whitespace.el: Use font-lock-flush. Minimize refontifications.
Side benefit: it works without jit-lock. (whitespace-point--used): New buffer-local var. (whitespace-color-on): Initialize it and flush it. Use font-lock-flush. (whitespace-color-off): Use font-lock-flush. (whitespace-point--used, whitespace-point--flush-used): New functions. (whitespace-trailing-regexp, whitespace-empty-at-bob-regexp) (whitespace-empty-at-eob-regexp): Use them. (whitespace-post-command-hook): Rewrite.
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