From: Juri Linkov <juri@linkov.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 59787@debbugs.gnu.org
Subject: bug#59787: 29.0.60; Very slow pos-visible-in-window-p with long truncated lines
Date: Wed, 07 Dec 2022 09:58:40 +0200 [thread overview]
Message-ID: <86bkofvd0v.fsf@mail.linkov.net> (raw)
In-Reply-To: <83v8mteffc.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 02 Dec 2022 22:09:11 +0200")
> As reported in https://debbugs.gnu.org/cgi/bugreport.cgi?bug=56682#1977:
>
> 2. after starting Isearch at a large column number,
> Emacs hangs up indefinitely, e.g. with
> 'M-g TAB 10000000 RET C-s' then even C-g doesn't get out.
> Debugging shows that the problem is in 'isearch-update'
> where the call to 'pos-visible-in-window-group-p' doesn't return.
> When this call is removed, the search is instantaneous.
> (Optimizing lazy-highlight is a separate problem in bug#56815.)
>
> The problem is that pos-visible-in-window-p starts from window-start point
> and goes to the POSITION passed as argument using move_it_to, which in this
> case is very slow, because it has all the 10000000 columns to traverse.
>
> The solution is to introduce shortcuts into pos_visible_p in this case.
Could you explain why pos-visible-in-window-p is instantaneous at any
position when long lines are not truncated. Why it doesn't need to
traverse 10000000 columns in this case?
next prev parent reply other threads:[~2022-12-07 7:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-02 20:09 bug#59787: 29.0.60; Very slow pos-visible-in-window-p with long truncated lines Eli Zaretskii
2022-12-07 7:58 ` Juri Linkov [this message]
2022-12-07 14:25 ` Eli Zaretskii
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