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bug#32280: 26.1; FLYSPELL-BUFFER sometimes misbehaves for some input in

From: Artem Boldarev
Subject: bug#32280: 26.1; FLYSPELL-BUFFER sometimes misbehaves for some input in a large enough buffer
Date: Mon, 30 Jul 2018 19:29:06 +0300
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1


Thanks, Agustin, this is an interesting find! I have altered my configuration as you suggested, and indeed I wasn't able to trigger the bug any more.


Anyway, I am pretty confident that altering the configuration does not resolve the bug, but rather hides it. I think so because of the following reasons:

1. I do not see why my previous configuration, which uses explicitly specified characters, is wrong. It works fine when spell checking as you type and for smaller buffers and regions (when flyspell-large-region does not get called).

2. Without the fix, the above-discussed inconsistency exists between how flyspell works when you use it for:

a) spell checking as you type and checking smaller regions of text (when flyspell-small-region gets called).
b) spell checking large regions of text.

It should be noted, that putting the cursor on a wrongly highlighted word when the flyspell mode is active, gets the word rechecked and un-highlighted. This behaviour demonstrates this inconsistency one more time.

In fact, this inconsistency is the bug which I reported.



I am using your example file with emacs -Q (Emacs 25) and had no problems,
flyspell-buffer works as expected after setting ispell-program-name to
hunspell and set ru_RU as dict (hunspell 1.6.2 here).

Local Ispell dictionary set to ru_RU
Starting new Ispell process hunspell with ru_RU dictionary...
Checking region...
Spell Checking...100% [laborum]
Spell Checking completed.

The auto-detected values for hunspell ru_RU are

(ru_RU [[:alpha:]] [^[:alpha:]]  t (-d ru_RU) nil utf-8)

Wonder why otherchars is not shown.

The codepage I specified in the configuration, as it seems, is not the
problem as spell checking works fine *most* of the time. I could spellcheck
large amounts of text without any issues. It seems that hunspell always uses
utf-8 internally, but I am not sure: I will try to investigate this.
Seems I was wrong, it is a long time since I digged there.

¿What happens if you use "[[:alpha:]]" and "[^[:alpha:]]" instead if the
explicit character strings 
and "[^АБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЬЫЪЭЮЯабвгдеёжзийклмнопрстуфхцчшщьыъэюя]"?


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