Switch to literal mode with message when regexp is too big in char-fold search
* lisp/char-fold.el (char-fold-to-regexp): Don't use regexp-quote when the length of regexp reaches 5000. (Bug#40216) * lisp/isearch.el (isearch-search): On big regexp in char-fold mode gracefully fall back to literal mode, try to search again and display momentary-message about switching to literal mode. (isearch--momentary-message): Add optional arg SECONDS.
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