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bug#5122: Mismatched parentheses when dealing with huge buffercontent

From: Eli Zaretskii
Subject: bug#5122: Mismatched parentheses when dealing with huge buffercontent
Date: Sat, 05 Dec 2009 11:27:51 +0200

> From: "Drew Adams" <address@hidden>
> Date: Fri, 4 Dec 2009 16:31:51 -0800
> Cc: address@hidden, address@hidden
> It's not real obvious when you see mismatch highlighting (and are used to it
> working) that the highlighting might not mean a mismatch at all, but just an
> insufficiently large option value. Many (most?) users will not even guess that
> there is such an option.
> Perhaps we could use a :help-echo property along with the mismatch highlight
> face, pointing to the option?

help-echo is not guaranteed to be seen, and could be tricky when
there's an important message in the echo area (especially if the
help-echo itself is displayed in the echo area).  Also, it will not
work on a text terminal.

I think it's better to modify the echo area message, such that if
Emacs hits the blink-matching-paren-distance limit (as opposed to
hitting point-min), the message says something like

  Mismatched parentheses (within blink-matching-paren-distance)

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