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bug#63187: 30.0.50; Tail of longer lines painted after end of nearby lin

From: Po Lu
Subject: bug#63187: 30.0.50; Tail of longer lines painted after end of nearby lines on macOS
Date: Mon, 01 May 2023 07:58:26 +0800
User-agent: Gnus/5.13 (Gnus v5.13) 
Aaron Jensen <aaronjensen@gmail.com> writes:

> Is there anything specific to macOS that is involved in scrolling 
> optimization?

Yes, Apple deleted the API used to perform bit blits, so Emacs uses a
workaround that I don't really understand, and seems unreliable.
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