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bug#24633: highlight-region func using (window-hscroll) in :align-to spe
From: |
Eli Zaretskii |
Subject: |
bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop |
Date: |
Sun, 09 Oct 2016 15:42:32 +0300 |
> From: npostavs@users.sourceforge.net
> Cc: 24633@debbugs.gnu.org
> Date: Sun, 09 Oct 2016 08:29:51 -0400
>
> Anyway, it doesn't seem worth going through this complexity. I just
> wonder if there is some way to stop bad lisp code from triggering a hard
> lockup. Can the display engine notice if it's looping and throw some
> kind of error? Maybe unset pre-redisplay-functions?
I don't see how we could detect loops in general. But for the
particular case of infinite hscrolling, we could perhaps count the
number of times hscroll_windows was called and returned a non-zero
value, and forcibly stop the loop after some reasonable number of
iterations.
Patches welcome. Could be a nice small project for someone who wants
to gain practice with hacking the display engine.
> >> >> According to `(elisp) Pixel Specification',
> >> >>
> >> >> The form NUM specifies a fraction of the default frame font
> >> >> height
> >> >> or width. The form `(NUM)' specifies an absolute number of pixels.
> >> >
> >> > I admire your courage in reading that documentation and then writing
> >> > stuff like the above, which the documentation doesn't mention even
> >> > remotely.
> >>
> >> Uh, not sure how to read this, is it irony?
> >
> > Only a little. I find this area severely under-documented.
>
> The grammar in the doc seems complete to me.
Do you really think that a formal grammar, whether accurate/complete
or not, is a good way of describing a feature?
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, npostavs, 2016/10/06
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, Eli Zaretskii, 2016/10/08
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, npostavs, 2016/10/08
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, Eli Zaretskii, 2016/10/08
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, npostavs, 2016/10/08
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, Eli Zaretskii, 2016/10/08
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, npostavs, 2016/10/09
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop,
Eli Zaretskii <=
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, npostavs, 2016/10/22
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, Eli Zaretskii, 2016/10/22
- bug#24633: highlight-region func using (window-hscroll) in :align-to spec can cause inf loop, npostavs, 2016/10/22