From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Spencer Baugh Newsgroups: gmane.emacs.help Subject: Re: Make scroll-{up, down} move point to {start, end} of newly visible text Date: Wed, 16 Aug 2023 13:55:42 -0400 Message-ID: References: <83mszb0w9l.fsf@gnu.org> <83sf8j6i9m.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32368"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:fyqw732UQoOXsoXRjlCopzdQyAM= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Aug 16 19:56:28 2023 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 1qWKkt-0008AK-Ul for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 16 Aug 2023 19:56:27 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qWKkO-0007eS-E1; Wed, 16 Aug 2023 13:55:56 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qWKkN-0007e5-3d for help-gnu-emacs@gnu.org; Wed, 16 Aug 2023 13:55:55 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qWKkK-00089O-L5 for help-gnu-emacs@gnu.org; Wed, 16 Aug 2023 13:55:54 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qWKkI-0007Fn-GZ for help-gnu-emacs@gnu.org; Wed, 16 Aug 2023 19:55:50 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:144836 Archived-At: Eli Zaretskii writes: >> From: Spencer Baugh >> Date: Wed, 16 Aug 2023 12:20:23 -0400 >> >> I thought about what behavior I want, exactly, and I think it's this: >> when point is off-screen after scroll-up, we should first try to move >> point to "window-end before we scrolled", and only if that position is >> also off-screen should we move point to window-start. (Currently we >> unconditionally move point to window-start) >> >> Like this: >> >> (defun my-scroll-up-command (&optional arg) >> (interactive "^P") >> (move-to-window-line -1) >> (scroll-up-command arg)) >> >> (defun my-scroll-down-command (&optional arg) >> (interactive "^P") >> (move-to-window-line 0) >> (scroll-down-command arg)) >> >> except of course this implementation moves point even if it's not >> necessary. >> >> Does this seem like a reasonable feature to add to the scrolling code? > > I don't understand what you have in mind. The above commands seem to > do what you want only when ARG is 1. Or what did I miss? They're actually wrong when ARG is 1, because they move point without needing to. They mostly only work when ARG is nil. See the prose description of what I want, the commands are close to but not exactly right because they move point unnecessarily: >> When point is off-screen after scroll-up, we should first try to move >> point to "window-end before we scrolled", and only if that position is >> also off-screen should we move point to window-start. (Currently we >> unconditionally move point to window-start) > For scrolling just one window-full, setting next-screen-context-lines > to 1 should do what you want. For scrolling more than that, I don't > understand how to generalize what you want. The prose description I gave generalizes just fine, doesn't it? The prose description is completely invariant to how much scrolling is done.