GNU bug report logs - #70038
29.3.50; Shift up/down in buffer with images on M-x other-window with some fonts

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From: martin rudalics <rudalics <at> gmx.at>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 70038 <at> debbugs.gnu.org
Subject: bug#70038: 29.3.50; Shift up/down in buffer with images on M-x other-window with some fonts
Date: Mon, 29 Apr 2024 11:47:49 +0200

>> There are three issues I don't understand well in this context.  The
>> first one concerns the preserve_vscroll_p flag we currently check as:
>>
>>        if (!w->preserve_vscroll_p && !window_frozen_p (w))
>> 	w->vscroll = 0;
>>
>> Here, in all scenarios I tried, I observed that w->preserve_vscroll_p
>
> ???  Have you enabled pixel-scroll-precision-mode, for which this flag
> was introduced?

Yes.

> p-s-p-m relies on vscroll values that it sets being
> preserved by force_start in all scenarios, which naturally includes
> those where the window start is frozen, just as it does those where it
> is variable.

When I ran the above with various debugger breakpoints I was not able to
trigger a configuration with w->preserve_vscroll_p true on an unfrozen
window.  In all the scenarios I tried, w->preserve_vscroll_p was reset
in mark_window_display_accurate_1 before arriving there.  Can you please
post a scenario where the difference matters?  If so, it might be worth
to shortly document it somewhere.

Thanks, martin

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