Fix Pike Mode's autodoc doc comments style's continued lines.
* lisp/progmodes/cc-engine.el (c-forward-sws, c-backward-sws): Recognize matches of c-doc-line-join-re as syntactic whitespace. (c-find-decl-prefix-search): Recognize and move over matches of c-doc-line-join-re as whitespace. (c-find-decl-spots): Before moving backward a char, check (bobp). Before moving forward over a comment, check it isn't possibly a "bright" comment. * lisp/progmodes/cc-fonts.el (c-get-doc-comment-style): New function, extracted from c-compose-keywords-list. (c-compose-keywords-list): Call the above new function. (pike-font-lock-keywords, pike-font-lock-keywords-2) (pike-font-lock-keywords-3): Call c-set-doc-comment-res. (c-doc-line-join-re, c-doc-bright-comment-start-re, c-doc-line-join-end-ch): New variables. (c-set-doc-comment-re-element, c-set-doc-comment-char-list): New macros. (c-set-doc-comment-res): New function. (c-font-lock-doc-comments): For consistency and repeatability, in a sequence of C++ style doc comments, don't fontify the region between BOL and the comment marker. (autodoc-line-join-re, autodoc-bright-comment-start-re) (autodoc-line-join-end-ch): New variables. * lisp/progmodes/cc-mode.el (c-doc-fl-decl-start, c-doc-fl-decl-end): New functions. (c-change-expand-fl-region, c-context-expand-fl-region): Call the above two new functions for extra possibilities for the start and end of a construct. * doc/misc/cc-mode.texi (Doc Comments): Add a sentence drawing attention to the possibility of fontifying constructs within a doc comment.
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