From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#63187: 30.0.50; Tail of longer lines painted after end of nearby lines on macOS Date: Mon, 01 May 2023 21:18:31 +0800 Message-ID: <87pm7kchqw.fsf@yahoo.com> References: <87ilddec31.fsf@yahoo.com> <87edo0exct.fsf@yahoo.com> <83wn1sns1n.fsf@gnu.org> Reply-To: Po Lu Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="13372"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: 63187@debbugs.gnu.org, aaronjensen@gmail.com To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon May 01 15:19:17 2023 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ptTQy-0003GY-T5 for geb-bug-gnu-emacs@m.gmane-mx.org; 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Hermes SMTP Server) with ESMTPA ID 1581771e649477d7728657f59704a935; Mon, 01 May 2023 13:18:35 +0000 (UTC) In-Reply-To: <83wn1sns1n.fsf@gnu.org> (Eli Zaretskii's message of "Mon, 01 May 2023 15:40:36 +0300") X-Mailer: WebService/1.1.21417 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:260865 Archived-At: Eli Zaretskii writes: >> Cc: 63187@debbugs.gnu.org >> Date: Mon, 01 May 2023 07:58:26 +0800 >> From: Po Lu via "Bug reports for GNU Emacs, >> the Swiss army knife of text editors" >> >> Aaron Jensen 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. > > You mean, ns_scroll_run in nsterm.m? Which parts of it do you not > understand? No, I meant the implementation of [EmacsView copyRect:] enabled under Mac OS; see line 8655 of nsterm.m. I don't understand how the system synchronizes its access to the window's backing store with Emacs's.