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.bugs Subject: bug#459: Zero-length overlays, overlay keymaps, and `overlays-at' Date: Mon, 19 Jul 2021 19:49:25 +0300 Message-ID: <83sg0a5jvu.fsf@gnu.org> References: <485D204B.2@dr-qubit.org> <875yx6mijw.fsf@gnus.org> <83y2a25ktq.fsf@gnu.org> <87y2a2i7kc.fsf@gnus.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1250"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 459@debbugs.gnu.org, t.s.cubitt.98@cantab.net To: Lars Ingebrigtsen , Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Jul 19 18:50:11 2021 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 1m5WT5-0000A9-8l for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 19 Jul 2021 18:50:11 +0200 Original-Received: from localhost ([::1]:50804 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m5WT4-0005LD-8S for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 19 Jul 2021 12:50:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36938) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m5WSw-0005L5-NI for bug-gnu-emacs@gnu.org; Mon, 19 Jul 2021 12:50:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:48608) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1m5WSw-0003ts-D4 for bug-gnu-emacs@gnu.org; Mon, 19 Jul 2021 12:50:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1m5WSw-0007gX-CO for bug-gnu-emacs@gnu.org; Mon, 19 Jul 2021 12:50:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 19 Jul 2021 16:50:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 459 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: moreinfo Original-Received: via spool by 459-submit@debbugs.gnu.org id=B459.162671337929506 (code B ref 459); Mon, 19 Jul 2021 16:50:02 +0000 Original-Received: (at 459) by debbugs.gnu.org; 19 Jul 2021 16:49:39 +0000 Original-Received: from localhost ([127.0.0.1]:60154 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1m5WSY-0007fp-O7 for submit@debbugs.gnu.org; Mon, 19 Jul 2021 12:49:39 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:39010) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1m5WSW-0007fc-VV for 459@debbugs.gnu.org; Mon, 19 Jul 2021 12:49:37 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:49598) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m5WSQ-0003YV-4Q; Mon, 19 Jul 2021 12:49:30 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:1848 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 1m5WSP-0008Do-1p; Mon, 19 Jul 2021 12:49:30 -0400 In-Reply-To: <87y2a2i7kc.fsf@gnus.org> (message from Lars Ingebrigtsen on Mon, 19 Jul 2021 18:37:07 +0200) 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" Xref: news.gmane.io gmane.emacs.bugs:210295 Archived-At: > From: Lars Ingebrigtsen > Cc: t.s.cubitt.98@cantab.net, 459@debbugs.gnu.org > Date: Mon, 19 Jul 2021 18:37:07 +0200 > > Eli Zaretskii writes: > > >> > a) Modify (overlays-at pos) to return zero-length overlays that start > >> > at pos (it already returns all other overlays that start at > >> > pos). Again, this seems unlikely to have significant impact on other > >> > parts of Emacs, since zero-length overlays are rarely used. > >> > > >> > b) Modify (overlays-at pos) to return zero-length overlays that start > >> > at pos, and have a null front-advance and non-nil rear-advance > >> > property. (The logic for this is the same as in option b) for the > >> > overlay keymaps issue.) > >> > > >> > c) Leave `overlays-at' unchanged, and define a new function > >> > `overlays-at-point' that implements either a) or b). > > [...] > > > We could add a new optional argument to overlays-at, to make it return > > such overlays. That would avoid the risk of breaking unsuspecting > > callers. > > Yeah, that's true. Do you have any opinion on whether a) or b) would > make the most sense if given this optional argument? I'm leaning > towards b)... b) is fine by me, but let's hear from Stefan as well.