Improve responsiveness while in 'replace-buffer-contents'
* src/editfns.c (buffer_chars_equal): Avoid calling buf_charpos_to_bytepos when the buffer is plain-ASCII. Suggested by Milan Stanojević <email@example.com>. Call maybe_quit to improve responsiveness. (Freplace_buffer_contents): Call maybe_quit. Warn in the doc string that the function could be slow. (Bug#31888)
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