From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Tick Reduction Date: Sat, 20 Nov 2021 16:35:48 +0200 Message-ID: <83lf1isxmj.fsf@gnu.org> References: <87bl2hyzca.fsf@gnus.org> <835ysoursn.fsf@gnu.org> <831r3cugcp.fsf@gnu.org> <83y25judps.fsf@gnu.org> <83tug7tjww.fsf@gnu.org> <83tug7rm0c.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="27091"; mail-complaints-to="usenet@ciao.gmane.io" Cc: larsi@gnus.org, emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Nov 20 15:36:44 2021 Return-path: Envelope-to: ged-emacs-devel@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 1moRTw-0006sM-7K for ged-emacs-devel@m.gmane-mx.org; Sat, 20 Nov 2021 15:36:44 +0100 Original-Received: from localhost ([::1]:59048 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1moRTu-0000nr-Bi for ged-emacs-devel@m.gmane-mx.org; Sat, 20 Nov 2021 09:36:42 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:57016) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1moRT0-0008Ou-A6 for emacs-devel@gnu.org; Sat, 20 Nov 2021 09:35:47 -0500 Original-Received: from [2001:470:142:3::e] (port=48580 helo=fencepost.gnu.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1moRSz-0000hd-OK; Sat, 20 Nov 2021 09:35:45 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-version:References:Subject:In-Reply-To:To:From: Date; bh=wMHn76Hi7N58CqrQ8H+DuIUM1dl6aoVM8o3wSDxxfPw=; b=E2c4ouguCKzgO5wMupsd iHWuA5OfI2PFhrf/Xh6tV6dl34ysVJLPhzukDs6iPbkXw/Rh9TBUY/JPV7tS1/DwCOMSTt/LGTp7R ZJQZLYY16UG/Dcz29ZFqOZJC2TXaeCsI7OntsAwxFI/me3Jl0+AspQW6S4u+0HZsvguH7S9EIVhnn CNrf0X2VO0oEsA22vIRTMR86eFV51Rpq3q+Rfu/E3DNXhrcvQ6HM0gHUyuYMBzO02IEaqLGASZryN xcpaHefdZopUly5yk33GuHwffbNXrmnvCN4oCdFWuNopAmlkhpqyMyzSkBm1fckjMxVnS7/aSSuJ+ +glOzUOgA7FAdg==; Original-Received: from [87.69.77.57] (port=1984 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1moRSz-0002lp-AD; Sat, 20 Nov 2021 09:35:45 -0500 In-Reply-To: (message from Stefan Monnier on Sat, 20 Nov 2021 09:06:45 -0500) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:279808 Archived-At: > From: Stefan Monnier > Cc: larsi@gnus.org, emacs-devel@gnu.org > Date: Sat, 20 Nov 2021 09:06:45 -0500 > > Eli Zaretskii [2021-11-20 15:32:04] wrote: > >> From: Stefan Monnier > >> Cc: larsi@gnus.org, emacs-devel@gnu.org > >> Date: Sat, 20 Nov 2021 08:11:06 -0500 > >> >> Yes, we may have to declare that for functions that "emulate" the > >> >> redisplay internally, the resulting horizontal position info might not > >> >> always be quite right (might not reflect what you'll see on the glass) > >> >> for text tat uses the new alignment functionality :-( > >> > That will break quite a few features, I'm afraid. > >> This will completely depend on the specifics of when/how the answer > >> isn't quite right, of course. > > AFAIU, it will never be right, as long as this kind of alignment is > > used on display. > > That completely depends on what the "redisplay emulation" code does. > It could opt to use the old (unreliable) glyph matrix to compute its > (documented as unreliable 🙍) info, in which case it could end up > breaking less often (but more spectacularly when it does)? As I explained earlier, that code cannot use the glyph matrix, because it is required to work with text that is not displayed at all.