From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Nick Helm Newsgroups: gmane.emacs.bugs Subject: bug#28312: 25.2; Arabic script changes when scrolling Date: Fri, 01 Sep 2017 20:16:55 +1200 Message-ID: References: <83lgly29zf.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1504253906 11378 195.159.176.226 (1 Sep 2017 08:18:26 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 1 Sep 2017 08:18:26 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (darwin) To: <28312@debbugs.gnu.org> Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Sep 01 10:18:16 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dnh9X-0002EY-Uu for geb-bug-gnu-emacs@m.gmane.org; Fri, 01 Sep 2017 10:18:12 +0200 Original-Received: from localhost ([::1]:52079 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dnh9d-0000p2-9X for geb-bug-gnu-emacs@m.gmane.org; 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As the >> buffer scrolls, some of the characters in the Arabic representations of >> the words "Arabic" and "Hello" change between at least two glyphs. > > Does the character also change its shape if you move cursor across > that line, especially when the cursor moves across the character? If I use the keyboard to move the cursor, no. The cursor changes shape to reflect the width of the glyph, and the direction of cursor movement correctly changes when over RTL text, as expected, but the chars themselves do not change. If I use the mouse to place the cursor in the line, yes. Glyphs near the cursor change shape and stay changed until I release . >> Here's a quick screen cap to show what I mean: >> https://ln.sync.com/dl/22d37f320/fwujc85a-dhb63yfw-cv5vhzj5-5qsis2h8 > > I cannot watch this movie with the software I have installed. Gah, sorry. Try this: https://ln.sync.com/dl/c0466f180/ju7j9ka3-ebq4uzfz-2wp4ehnu-3szvp5jd > Arabic needs shaping support from the underlying font back-end, so > (unless this will be reproduced on GNU/Linux) it sounds like something > is wrong with either the back-end Emacs uses on Darwin, or its version > you have installed, or with the support code in Emacs which is needed > for displaying complex RTL scripts such as Arabic. When I open HELLO using LibreOffice, which also supports RTL on mac, the problem doesn't seem to occur using Geeza Pro or Arial Unicode MS. Not sure if that is relevant.