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bug#14427: 24.3.50; Highlight symbol at point

From: Juri Linkov
Subject: bug#14427: 24.3.50; Highlight symbol at point
Date: Mon, 03 Jun 2013 11:54:05 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (x86_64-pc-linux-gnu)

>> If you could commit this change, I can start using it right away.

Thanks for the reminder, this is installed now.

> Small note.  I haven't tested the isearch portions of the patch.

Isearch integration with hi-lock is far from ideal yet.
The limiting factor is that hi-lock is based on font-lock
when font-lock is enabled.  Otherwise, it is plain search-based.

Perhaps we should check in `isearch-highlight-regexp'
whether font-lock is active in the current buffer,
and when font-lock is disabled then let-bind all relevant
search variables like `lax-whitespace', `search-invisible',
filters, etc.  So search-based hi-lock will be able to highlight
correctly the same matches as isearch.

This will provide the correct conversion of the search parameters
to hi-lock (at least partly for the case when font-lock is disabled
and hi-lock is search-based).

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