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Re: Stipples and scroll optimizations

From: Po Lu
Subject: Re: Stipples and scroll optimizations
Date: Sun, 08 May 2022 15:34:17 +0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.91 (gnu/linux) 
Eli Zaretskii <eliz@gnu.org> writes:

> If using scrolling_window in this case causes incorrect display, then
> scrolling_window should be disabled.  But how would you know, in
> update_window or its subroutines, that this is the case?

We could make x_draw_glyph_string (and its counterparts) set a flag
inside the glyph row if a stipple is encountered, and then test that
inside scrolling_window.
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