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bug#24109: 24.5; Long lines in message mode make Emacs irresponsive


From: Yuri D'Elia
Subject: bug#24109: 24.5; Long lines in message mode make Emacs irresponsive
Date: Wed, 31 Aug 2016 18:49:30 +0200
User-agent: mu4e 0.9.17; emacs 24.5.1

On Wed, Aug 31 2016, Eli Zaretskii <address@hidden> wrote:
> OK, thanks.  Next question: why does hscroll_windows returns non-zero
> when called repeatedly?  It is supposed to do that only once; the next
> call should return zero.
>
> For starters, in this line:
>
>             if (w->hscroll != hscroll)
>
> what are the values of those two, and do they change each time
> hscroll_windows is called in the infloop, for the selected window?

They swap the value at each iteration:

Thread 1 "emacs" hit Breakpoint 14, hscroll_window_tree (window=20142453) at 
xdisp.c:13086
$154 = 0
$155 = 487
Continuing.

Thread 1 "emacs" hit Breakpoint 14, hscroll_window_tree (window=20142453) at 
xdisp.c:13086
$156 = 487
$157 = 0
Continuing.

...






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