Fix an infinite loop in c-end-of-macro. Should fix bug #36484
Also fix two faulty regexps, save-match-data, and check c-major-mode-is 'c++-mode where needed. * lis/progmodes/cc-langs.el (c-last-c-comment-end-on-line-re) (c-last-open-c-comment-start-on-line-re): Handle repeated *s in regexp correctly. * lisp/progmodes/cc-engine.el (c-beginning-of-macro, c-end-of-macro): Protect the match-data with save-match-data around regexp operations. (c-end-of-macro): In the loop handling multiline block comments, check a comment actually is multiline. * lisp/progmodes/cc-mode.el (c-depropertize-CPP): Only call c-depropertize-raw-strings-in-region in C++ Mode.
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