bug#25133: 26.0.50; compile.el multiline regexp handling

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tags 25133 confirmed
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Felix Klock <pnkfelix@mozilla.com> writes:

> Multiline compilation regexps do not reliably match.

I see Stefan Monnier added a check for a `compilation-multiline' text
property in [1], but I don't see any code that creates such a property.
Perhaps multiline support for compile.el was simply never finished?

[1]: Mon Oct 7 01:15:48 2013 -0400
http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=55ca2c0df0b7bdc2c425c17cc74dfc08a9ad236c
* lisp/progmodes/compile.el (compilation-parse-errors):
Use compilation--put-prop.
(compilation--ensure-parse): Check compilation-multiline.