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bug#22519: 25.1.50; Emacs gets stuck while doing incremental search forw

From: Vincent Belaïche
Subject: bug#22519: 25.1.50; Emacs gets stuck while doing incremental search forward
Date: Tue, 24 May 2016 12:16:24 +0200

Le 17/03/2016 à 17:20, Eli Zaretskii a écrit :
>> From: address@hidden (Vincent Belaïche)
>> Cc: Vincent Belaïche <address@hidden>,
>>   address@hidden
>> Date: Thu, 17 Mar 2016 10:14:04 +0100


>> Would it be agreable if I make the following addition to the manual:
> I think this should be rewritten to go to etc/PROBLEMS instead of into
> the manual.

Ok, should I make this edit only for master branch, or for emacs-25
branch first & then merge it into master branch. In the latter case, it
would be helpful if you send me a pointer to instructions how to carry
out the merge with git.

FYI I have not tested that the bug is also there for emacs-25 branch, I
just can't imagine that it would not be there also.


PS: FYI, attached is patch to master branch.

> Thanks.

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index f61921a..39a5849 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -720,6 +720,20 @@ the following variables: tex-font-script-display (how much 
 lower/raise); tex-suscript-height-ratio (how much smaller than
 normal); tex-suscript-height-minimum (minimum height).
+** Screen refresh is slow when there are special characters for which no 
suitable font is available
+If the display is too slow in refreshing when you scroll to a new
+region, or when you edit the buffer, it may be due to this that some
+characters cannot be displayed in the default font, and Emacs is
+spending too much time in looking for a suitable font to display them.
+You can suspect this if you have several characters that are displayed
+as small rectangles containing a hexadecimal code inside.
+The solution is to install the appropriate fonts on your machine. For
+instance if you are editing a text with a lot of math symbols, then
+installing a font like 'Symbola' should solve this problem.
 * Internationalization problems
 ** M-{ does not work on a Spanish PC keyboard.

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