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.help Subject: Re: Have to run redraw-display manually Date: Tue, 21 Sep 2021 14:54:35 +0300 Message-ID: <831r5iywhw.fsf@gnu.org> References: <83h7eez3dd.fsf@gnu.org> <835yuuyy9a.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="22048"; mail-complaints-to="usenet@ciao.gmane.io" To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Sep 21 13:55:45 2021 Return-path: Envelope-to: geh-help-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 1mSeNE-0005aa-Pa for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 21 Sep 2021 13:55:44 +0200 Original-Received: from localhost ([::1]:39964 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mSeND-0000oB-9I for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 21 Sep 2021 07:55:43 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56102) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mSeME-0000o2-M0 for help-gnu-emacs@gnu.org; Tue, 21 Sep 2021 07:54:42 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:46648) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mSeME-0001rb-BD for help-gnu-emacs@gnu.org; Tue, 21 Sep 2021 07:54:42 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:4296 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 1mSeMD-0003ro-Tv for help-gnu-emacs@gnu.org; Tue, 21 Sep 2021 07:54:42 -0400 In-Reply-To: (message from Cos Chan on Tue, 21 Sep 2021 13:33:40 +0200) X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:133131 Archived-At: > From: Cos Chan > Date: Tue, 21 Sep 2021 13:33:40 +0200 > > > My suggestion is not to do "tabs 4", it changes how the terminal > > behaves regarding cursor motion. > > > > > Clear and I will not do it. May I suggest adding this warning to the Emacs > documents? I would instead suggest that you report this as a bug, using the "M-x report-emacs-bug" command. It is possible that Emacs should be able to automatically detect this situation somehow; currently it doesn't, and I'm not an expert in this area to know if it could and how. Be sure to mention the "tabs 4" command in your report, as that is the root cause. > And I am pretty sure before I upgraded the Emacs there was no such issue. > But I don't remember the version number of the Emacs I had. It doesn't have to do anything with the Emacs version. Emacs employs a complicated algorithm to determine the least expensive sequence of terminal commands to send to the terminal, given some cursor movement. The output depends on many factors, such as your terminal screen dimensions etc. So it could be that you never saw this before due to factors other than the Emacs version. It is also possible that this is related to the fact that we nowadays use terminfo for finding out the terminal capabilities, whereas we used termcap in older versions. Reporting a bug will allow us to investigate this thoroughly and see what can be done. Thanks.