From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Marcin Borkowski Newsgroups: gmane.emacs.help Subject: Re: Inspecting behaviour of `make-overlay', is this expected? Date: Sun, 25 Dec 2022 09:03:24 +0100 Message-ID: <87mt7bsyer.fsf@mbork.pl> References: <83cz895has.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="28534"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: mu4e 1.1.0; emacs 29.0.50 Cc: help-gnu-emacs@gnu.org To: Eli Zaretskii Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Dec 25 09:04:27 2022 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 1p9Lze-0007CX-Bv for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 25 Dec 2022 09:04:26 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p9Lz4-0003i7-BJ; Sun, 25 Dec 2022 03:03:50 -0500 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 1p9Lyy-0003hf-CP for help-gnu-emacs@gnu.org; Sun, 25 Dec 2022 03:03:45 -0500 Original-Received: from mail.mojserwer.eu ([195.110.48.8]) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p9Lyw-0003Jt-E7; Sun, 25 Dec 2022 03:03:44 -0500 Original-Received: from localhost (localhost [127.0.0.1]) by mail.mojserwer.eu (Postfix) with ESMTP id A4501821BA1; Sun, 25 Dec 2022 09:03:32 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at mail.mojserwer.eu Original-Received: from mail.mojserwer.eu ([127.0.0.1]) by localhost (mail.mojserwer.eu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2u-qVX7CiGFc; Sun, 25 Dec 2022 09:03:28 +0100 (CET) Original-Received: from localhost (178235147024.dynamic-3-poz-k-0-1-0.vectranet.pl [178.235.147.24]) by mail.mojserwer.eu (Postfix) with ESMTPSA id DFC28821B8C; Sun, 25 Dec 2022 09:03:27 +0100 (CET) In-reply-to: <83cz895has.fsf@gnu.org> Received-SPF: pass client-ip=195.110.48.8; envelope-from=mbork@mbork.pl; helo=mail.mojserwer.eu X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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:141931 Archived-At: On 2022-12-24, at 09:36, Eli Zaretskii wrote: >> Date: Sat, 24 Dec 2022 10:52:47 +0300 >> From: Jean Louis >> >> XXXXXXXXXX >> ^ >> | position 0 in buffer >> >> (setq my-overlay (make-overlay 0 10)) >> (get-buffer-window (overlay-buffer my-overlay)) >> (overlay-put my-overlay 'display "Hello") then I get: >> >> HelloX >> >> instead of "Hello" >> >> Is this normal behavior? > > Yes. The 10 part says that the overlay _ends_ before position 10. > This is standard Emacs behavior with text properties and overlays: END > means the first character NOT affected by the property/overlay. Somewhat related: https://fhur.me/posts/always-use-closed-open-intervals (not my piece, just found it on the internet; also I do not want to imply the OP doesn't know/understand that - but I consider this short article interesting & worthwhile also for others reading this). Best, -- Marcin Borkowski http://mbork.pl