From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stephen Berman Newsgroups: gmane.emacs.bugs Subject: bug#43835: 28.0.50; auto-hscroll-mode/current-line + show-paren-mode + gnus-summary-mode = bug Date: Tue, 06 Oct 2020 22:05:42 +0200 Message-ID: <87h7r7nmqx.fsf@gmx.net> References: <87lfgjnq2m.fsf@gmx.net> <83lfgj9nml.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37572"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: 43835@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Oct 06 22:06:42 2020 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 1kPtEQ-0009hl-1u for geb-bug-gnu-emacs@m.gmane-mx.org; 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Tue, 06 Oct 2020 22:05:49 +0200 In-Reply-To: <83lfgj9nml.fsf@gnu.org> (Eli Zaretskii's message of "Tue, 06 Oct 2020 22:10:26 +0300") X-Provags-ID: V03:K1:7SFslwjk/bQ8ilZxHr0EKDsw3nyPK8tKHAa1zYgqXr4WqbF5fPX 2UWAE4QhTkC2iKomET/o+GK/KzhPFfSbc5hmdLdgc9XTe53EVK8hzU6E8DmAdn1hbAi3nuU akKHpnZ/rEF7g25nSJyFEJXFAIGGwZPiXrzvbbmdA/rY5W9lilRu9s0m/MPlILvtgSYBGYD bMN3GSlCBsrYXG1vTxlSg== X-UI-Out-Filterresults: notjunk:1;V03:K0:pEw0Ts/ilbE=:JWcDCHE8JSgucc7z+S/RML bDrwPrVGbjabZotJNzEmZE+tMoWTpJspq+ef8ugzQGit7dNMnQ3Sf28O7xLGCcu2Wozh8+bkC 2lEyS5KTPhsEjfrCaZ1lbeg64QT0Dd8HCvvgjGQHT5Dr3gm3WHqzWUs3PR7BBvYzAp8suc/eN /0yHyoGxVGSrJol4D1bzG0vH3wuZYK0rzvdm61JjBy6kyTvsZiD3/PRlVts+rRZgQpMIjw3hk twJE86+fl+93Jst21inIHOjxExLVTrG8Hjntk6s4E/QUHcRXKmTY4npOBcLOH8OLmok0HO6qJ hf6OSD5cnQEaUpCbG/8Y4952izZBY9fa6d9QUXnmifwtBO1+Z2gX1mWvXLgt62QVJ/j0LIzQC BWxX99bDuq2DlJ6Lhd7H+zwmww1EvbOL2PoSAjBbkG8JJC5I+3r4t8jVF5HbwJoy2Aqqe4nyN NDdoEUgbyALUgKK0NRvoWi+a23iINpZxtNOMnT7ba35VGOv/FUmFpqG0NukF1YnnBNImk4HxE OOsggCXwOjk/bjgc0YcOWMIU46FbJgp+9JeXszX79TogZGncScgqg35Qwk1YgL3tAzOPpLwqk igEoisT9ug3CVYwJ8d9gXyCdMd1dhSPtC3qUCi4vbzLURrueacHQE1tTyVc4ycqnN/ea5aMP2 YFipPNPzXG40JDkj1yPtmBZd0UGatA4e2Gb30jdH+3NKdqRTg7KGXKS91mM43kqalKPrT8fia zDhPP09B3H76d3FWE8nninUaUwJ3Z6xLi4IGGBIwQrknoaLEV2LL5IVwUBp5PiQxNzcY78nf 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:189937 Archived-At: On Tue, 06 Oct 2020 22:10:26 +0300 Eli Zaretskii wrote: >> From: Stephen Berman >> Date: Tue, 06 Oct 2020 20:53:53 +0200 >> >> I have observed a quirk in auto hscrolling the current line under >> specific conditions. I have only seen it in gnus-summary-mode, but >> there can reproduce it reliably with the following recipe: > > Thanks, but having Gnus in the picture is too much. Debugging > redisplay issues involved in these momentary movements is hard as it > is already. I believe you, and I wish I could remove Gnus from the recipe (I've been seeing this problem for at least three years, but only today did I recognize that show-paren-mode was involved and so could reliably reproduce it). > You could perhaps help me come up with ideas if, in a build configured > with --enable-checking=3D'yes,glyphs', you did the following: > > emacs -Q > M-x blink-cursor-mode RET > M-x global-eldoc-mode RET > > Then perform your recipe up to and excluding step 8. > > M-x trace-redisplay RET > > Wait till there are no more messages printed to stderr, then perform > step 8 and notice the messages it causes to be printed, after you type > C-e. > > Then do the same experiment, but with some other buffer, where you say > that the problem doesn't happen, and tell what messages were printed > by trace-redisplay in that case after C-e. If there's any difference > between these two scenarios visible in the trace, that could give some > ideas regarding the possible cause(s). > > Thanks. Thanks for the suggestions, I'll try them as soon as I can and report back= . >> I can reproduce this problem in Emacs 26, 27 and master, but I have onl= y >> been able to reproduce it in Gnus summary buffers, and only on the last >> line of the summary and only when this line is longer than window-width >> (so that hscrolling can happen) and the line ends with a pair of paren >> characters (brackets and braces also show the effect) and >> show-paren-mode is enabled. Sometimes I have seen the hscroll get >> restored after a several seconds, but other times this does not happen >> (though I haven't tried waiting for more than maybe 15-20 seconds). > > Does the hscroll get restored if you type "M-x"? As soon as I type `M-x' I see the line scroll left and the cursor at the end, and it remains like that, but if I then type `C-g', the line scrolls back to the right and point is again not visible, as in step 8. > P.S. Please remember performing all these tests with both > blink-cursor-mode and global-eldoc-mode disabled. Those two cause > frequent redisplay cycles that can completely obscure the actual > problems. Ok. Steve Berman