From unknown Tue Aug 19 05:08:45 2025 X-Loop: help-debbugs@gnu.org Subject: bug#19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs. Resent-From: Keith David Bershatsky Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 25 Jan 2015 07:21:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 19684 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: 19684@debbugs.gnu.org X-Debbugs-Original-To: bug-gnu-emacs@gnu.org Received: via spool by submit@debbugs.gnu.org id=B.14221704097552 (code B ref -1); Sun, 25 Jan 2015 07:21:02 +0000 Received: (at submit) by debbugs.gnu.org; 25 Jan 2015 07:20:09 +0000 Received: from localhost ([127.0.0.1]:55570 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFHUN-0001xj-Mk for submit@debbugs.gnu.org; Sun, 25 Jan 2015 02:20:08 -0500 Received: from eggs.gnu.org ([208.118.235.92]:53508) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFHUL-0001ww-8p for submit@debbugs.gnu.org; Sun, 25 Jan 2015 02:20:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFHUD-0007UI-Up for submit@debbugs.gnu.org; Sun, 25 Jan 2015 02:19:59 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:34682) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHUD-0007UE-S2 for submit@debbugs.gnu.org; Sun, 25 Jan 2015 02:19:57 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55230) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHUC-0002Uf-2H for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:19:57 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFHU7-0007Tq-1T for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:19:56 -0500 Received: from cobb.liquidweb.com ([50.28.13.150]:42442) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHU6-0007Sv-Pj for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:19:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lawlist.com; s=default; h=Content-Type:MIME-Version:Subject:To:From:Message-ID:Date; bh=M09rpbZ1wPl2b44TfPhuO0MWTjj+PV09Hu6EZ0DoLpA=; b=7f1snOoxb4rxuTkHPKRdrmcxnRlU82F57OGwTPTca9iwoyT/3VXH2i718uL/8rVSPPJxG2H5cvi9gRXs/O2qB2wqwjmvKEkYQuU+W9RFRLjBlY7gSfllxO1bj2v8FYlw; Received: from cpe-104-173-54-60.socal.res.rr.com ([104.173.54.60]:55593 helo=MP.local) by cobb.liquidweb.com with esmtp (Exim 4.82) (envelope-from ) id 1YFHU3-0008MU-8B for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:19:47 -0500 Date: Sat, 24 Jan 2015 23:19:48 -0800 Message-ID: From: Keith David Bershatsky MIME-Version: 1.0 (generated by - "") Content-Type: text/plain; charset=US-ASCII X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cobb.liquidweb.com X-AntiAbuse: Original Domain - gnu.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lawlist.com X-Get-Message-Sender-Via: cobb.liquidweb.com: acl_c_relayhosts_text_entry: lawlist|lawlist.com X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) To the extent that a user wishes to use the value of `this-command` within a function attached to the `window-scroll-functions` hook, a workaround is needed because the default value is `nil`. In other words, something at the C source code level is setting the value to `nil` before the `window-scroll-functions` hook runs. There are two (2) workarounds that I am aware of. 1. Expressly call `redisplay` at the tail end of the series of functions attached to the `post-command-hook`. Calling `redisplay` somehow prevents `this-command` from being reset to `nil` and the `window-scroll-functions` hook can then take advantage of the existing value of `this-command`. 2. Create a separate variable -- e.g., `my-this-command` and set the value within a function attached to the `post-command-hook`. Like so: (setq my-this-command this-command). And, then use the value of `my-this-command` within the function attached to the `window-scroll-functions` hook. The most reliable test I have discovered to pinpoint when the `window-scroll-functions` hook will activate is by having the following code within a function attached to the `post-command-hook`: (pos-visible-in-window-p (point) (get-buffer-window (current-buffer) (selected-frame))). If the result is `t`, then the `window-scroll-functions` hook will be activating. I do not see a visual difference between either of the two workarounds mentioned above, even though I would expect to see a flicker on the screen with the first workaround. However, there is no flicker. The second workaround is probably a safer bet. Although this bug report has been submitted with Emacs Trunk from October 1, 2014; the behavior is the same with Emacs Trunk built on January 1, 2015. Thanks, Keith ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; In GNU Emacs 25.0.50.1 (x86_64-apple-darwin10.8.0, NS appkit-1038.36 Version 10.6.8 (Build 10K549)) of 2014-10-01 on MP.local Repository revision: 117996 dmantipov@yandex.ru-20141001132108-zdsxru2390mqyjlu Windowing system distributor `Apple', version 10.3.1038 Configured using: `configure --with-ns' Configured features: ACL LIBXML2 ZLIB Important settings: locale-coding-system: utf-8-unix Major mode: Fundamental Minor modes in effect: sd-mode: t sb-mode: t tb-mode: t shell-dirtrack-mode: t cm-mode: t frame-bufs-mode: t bc-mode: t ds-mode: t ml-mode: t Recent input: x r e p o r t - e m a c s - b u g Recent messages: Wrote /Users/HOME/.0.data/.0.emacs/.lock Load-path shadows: /Users/HOME/.0.data/.0.emacs/.0.wl/md4 hides /Users/HOME/.0.data/.0.emacs/Emacs_10_01_2014.app/Contents/Resources/lisp/md4 /Users/HOME/.0.data/.0.emacs/.0.wl/hex-util hides 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czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process cocoa ns multi-tty emacs) Memory information: ((conses 16 1229677 95833) (symbols 48 61646 0) (miscs 40 105 150) (strings 32 132512 13095) (string-bytes 1 4616193) (vectors 16 33496) (vector-slots 8 697599 22896) (floats 8 942 252) (intervals 56 4202 0) (buffers 976 11)) From unknown Tue Aug 19 05:08:45 2025 X-Loop: help-debbugs@gnu.org Subject: bug#19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs. Resent-From: martin rudalics Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 25 Jan 2015 10:40:04 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 19684 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Keith David Bershatsky , 19684@debbugs.gnu.org Received: via spool by 19684-submit@debbugs.gnu.org id=B19684.142218235025221 (code B ref 19684); Sun, 25 Jan 2015 10:40:04 +0000 Received: (at 19684) by debbugs.gnu.org; 25 Jan 2015 10:39:10 +0000 Received: from localhost ([127.0.0.1]:55607 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFKb0-0006Yj-FA for submit@debbugs.gnu.org; Sun, 25 Jan 2015 05:39:10 -0500 Received: from mout.gmx.net ([212.227.15.19]:49756) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFKaz-0006YN-64 for 19684@debbugs.gnu.org; Sun, 25 Jan 2015 05:39:09 -0500 Received: from [93.82.15.236] ([93.82.15.236]) by mail.gmx.com (mrgmx002) with ESMTPSA (Nemesis) id 0M8NWM-1XTIBT3pwI-00vuJO; Sun, 25 Jan 2015 11:39:02 +0100 Message-ID: <54C4C7BB.5070204@gmx.at> Date: Sun, 25 Jan 2015 11:38:51 +0100 From: martin rudalics MIME-Version: 1.0 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V03:K0:aKNUuCk6BhR9vm9Wf5aooso+kqxvRS6otXxpsCHgDR2QQnv7aHy BxyUmFD70a84vDRyOmkgiV3Cchn68F02xGP7W1S7jgV+Wv9wylV9ecX75uF5ec9PIbx3RKc umd/ObEbhjTAstTbI25vMJfwHpZeZqstuEo2Rx5gp3snjfHgraGVwiIKLXmR+TQ7HQKayTr uapY/EODSMijv7WGlKMAA== X-UI-Out-Filterresults: notjunk:1; X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) > To the extent that a user wishes to use the value of `this-command` > within a function attached to the `window-scroll-functions` hook, a > workaround is needed because the default value is `nil`. In other > words, something at the C source code level is setting the value to > `nil` before the `window-scroll-functions` hook runs. Couldn't you use `last-command' here? martin From unknown Tue Aug 19 05:08:45 2025 X-Loop: help-debbugs@gnu.org Subject: bug#19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs. Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 25 Jan 2015 15:34:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 19684 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Keith David Bershatsky Cc: 19684@debbugs.gnu.org Reply-To: Eli Zaretskii Received: via spool by 19684-submit@debbugs.gnu.org id=B19684.142220002524998 (code B ref 19684); Sun, 25 Jan 2015 15:34:01 +0000 Received: (at 19684) by debbugs.gnu.org; 25 Jan 2015 15:33:45 +0000 Received: from localhost ([127.0.0.1]:55957 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFPC4-0006V5-HY for submit@debbugs.gnu.org; Sun, 25 Jan 2015 10:33:44 -0500 Received: from mtaout27.012.net.il ([80.179.55.183]:44441) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFPC2-0006Uq-Co for 19684@debbugs.gnu.org; Sun, 25 Jan 2015 10:33:43 -0500 Received: from conversion-daemon.mtaout27.012.net.il by mtaout27.012.net.il (HyperSendmail v2007.08) id <0NIQ00900O3QFQ00@mtaout27.012.net.il> for 19684@debbugs.gnu.org; Sun, 25 Jan 2015 17:26:41 +0200 (IST) Received: from HOME-C4E4A596F7 ([87.69.4.28]) by mtaout27.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0NIQ0066DO8HK030@mtaout27.012.net.il>; Sun, 25 Jan 2015 17:26:41 +0200 (IST) Date: Sun, 25 Jan 2015 17:33:20 +0200 From: Eli Zaretskii In-reply-to: X-012-Sender: halo1@inter.net.il Message-id: <8361buswn3.fsf@gnu.org> References: X-Spam-Score: 1.0 (+) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 1.0 (+) > Date: Sat, 24 Jan 2015 23:19:48 -0800 > From: Keith David Bershatsky > > To the extent that a user wishes to use the value of `this-command` within a > function attached to the `window-scroll-functions` hook, a workaround is needed > because the default value is `nil`. In other words, something at the C source > code level is setting the value to `nil` before the `window-scroll-functions` > hook runs. That "something" is the command loop itself: it resets 'this-command' when the command finishes and returns to the loop. Recall that in Emacs, execution of commands running the Lisp interpreter is separated from redisplay: the latter runs when Emacs is idle and is waiting for input. Since most of the calls to window-scroll-functions are made by the display engine, the command already returned to the command loop by that time. > Calling `redisplay` somehow prevents `this-command` from being reset > to `nil` I hope it is now clear why this happens: in this scenario redisplay is entered before the command finishes, so 'this-command' was still not reset. > The most reliable test I have discovered to pinpoint when the > `window-scroll-functions` hook will activate is by having the following code > within a function attached to the `post-command-hook`: > (pos-visible-in-window-p (point) (get-buffer-window (current-buffer) > (selected-frame))). If the result is `t`, then the `window-scroll-functions` > hook will be activating. You are well-advised not to depend on such implementation details. > Although this bug report has been submitted with Emacs Trunk from October 1, > 2014; the behavior is the same with Emacs Trunk built on January 1, 2015. Emacs always behaved like that. And it's not a bug. From unknown Tue Aug 19 05:08:45 2025 X-Loop: help-debbugs@gnu.org Subject: bug#19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs. Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 25 Jan 2015 16:15:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 19684 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Keith David Bershatsky Cc: 19684@debbugs.gnu.org Received: via spool by 19684-submit@debbugs.gnu.org id=B19684.142220246732360 (code B ref 19684); Sun, 25 Jan 2015 16:15:01 +0000 Received: (at 19684) by debbugs.gnu.org; 25 Jan 2015 16:14:27 +0000 Received: from localhost ([127.0.0.1]:56056 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFPpS-0008Pl-Fp for submit@debbugs.gnu.org; Sun, 25 Jan 2015 11:14:26 -0500 Received: from pruche.dit.umontreal.ca ([132.204.246.22]:49006) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFPpQ-0008PT-0u; Sun, 25 Jan 2015 11:14:24 -0500 Received: from ceviche.home (lechon.iro.umontreal.ca [132.204.27.242]) by pruche.dit.umontreal.ca (8.14.1/8.14.1) with ESMTP id t0PGEMtF014830; Sun, 25 Jan 2015 11:14:22 -0500 Received: by ceviche.home (Postfix, from userid 20848) id 4BDBE66135; Sun, 25 Jan 2015 11:14:22 -0500 (EST) From: Stefan Monnier Message-ID: References: Date: Sun, 25 Jan 2015 11:14:22 -0500 In-Reply-To: (Keith David Bershatsky's message of "Sat, 24 Jan 2015 23:19:48 -0800") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-NAI-Spam-Flag: NO X-NAI-Spam-Threshold: 5 X-NAI-Spam-Score: 0 X-NAI-Spam-Rules: 1 Rules triggered RV5197=0 X-NAI-Spam-Version: 2.3.0.9393 : core <5197> : inlines <1943> : streams <1379257> : uri <1843774> X-Spam-Score: -1.3 (-) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -1.3 (-) tags 19684 notabug thanks > 1. Expressly call `redisplay` at the tail end of the series of > functions attached to the `post-command-hook`. > Calling `redisplay` somehow prevents `this-command` from being > reset to `nil` and the `window-scroll-functions` hook can then > take advantage of the existing value of `this-command`. It's not that calling `redisplay' prevents it. It's that the normal redisplay is run later (potentially much later if there are other things pending), at a point which is not directly connected with the command, hence this-command is not set any more because we're really not in the process of running that command any more. Stefan From unknown Tue Aug 19 05:08:45 2025 X-Loop: help-debbugs@gnu.org Subject: bug#19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs. References: In-Reply-To: Resent-From: Keith David Bershatsky Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 25 Jan 2015 17:43:04 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 19684 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: notabug To: Martin Rudalics , Eli Zaretskii , Stefan Monnier Cc: 19684@debbugs.gnu.org Received: via spool by 19684-submit@debbugs.gnu.org id=B19684.142220777620871 (code B ref 19684); Sun, 25 Jan 2015 17:43:04 +0000 Received: (at 19684) by debbugs.gnu.org; 25 Jan 2015 17:42:56 +0000 Received: from localhost ([127.0.0.1]:56155 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFRD5-0005QX-NZ for submit@debbugs.gnu.org; Sun, 25 Jan 2015 12:42:56 -0500 Received: from cobb.liquidweb.com ([50.28.13.150]:54535) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFRD3-0005Q7-4p for 19684@debbugs.gnu.org; Sun, 25 Jan 2015 12:42:54 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lawlist.com; s=default; h=Content-Type:MIME-Version:Subject:Cc:To:From:Message-ID:Date; bh=PcTJDmOqOtftOZSVzGMBtQLLnyt3R40kxoLUqGxy9X0=; b=vXJIxOm5iY3gfhle4JmdGZRFjFRHOkiyeMcwrVDCi1Oqw7FZMIESv6UZJwKxS45r/ulHbGjVJa8/ICfaI2pehWBXyJgxVRLDezv9AGka8tCMCFyoVmcF3X11sajM7Vmx; Received: from cpe-104-173-54-60.socal.res.rr.com ([104.173.54.60]:49746 helo=MP.local) by cobb.liquidweb.com with esmtp (Exim 4.82) (envelope-from ) id 1YFRCu-0000BR-EG; Sun, 25 Jan 2015 12:42:44 -0500 Date: Sun, 25 Jan 2015 09:42:44 -0800 Message-ID: From: Keith David Bershatsky MIME-Version: 1.0 (generated by - "") Content-Type: text/plain; charset=US-ASCII X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cobb.liquidweb.com X-AntiAbuse: Original Domain - debbugs.gnu.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lawlist.com X-Get-Message-Sender-Via: cobb.liquidweb.com: acl_c_relayhosts_text_entry: lawlist|lawlist.com X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.0 (/) Thank you (Eli, Stefan and Martin) for helping me to better understand how the redisplay process works. I was surprised to learn that I could not depend upon either `this-command` or `last-command` when using the `window-scroll-functions` hook because a forced redisplay prior thereto -- e.g., `(redisplay)` -- makes a difference in the values. To obtain the name of the interactive function that ran before the `window-scroll-functions` hook was triggered: `this-command` may be used in the `window-scroll-functions` when there IS a forced redisplay prior thereto. `last command` may be used in the `window-scroll-functions` when there is NOT a forced redisplay prior thereto. I am unaware of any documentation that could have helped me to discover the behavior described above. Perhaps the Emacs team might consider adding something to the doc-string and/or the manual so that a user is advised as to the behavior, and to suggest an alternative approach: ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; (defvar my-command nil) (defun set-my-command () (setq my-command this-command)) (add-hook 'post-command-hook 'set-my-command) (defun wsf-fn (win _start) "NOTE: Since the `window-scroll-functions` hook may be called more than once, the user may not wish to set `my-command` to `nil` at this time." (message "my-command: %s | this-command: %s | last-command: %s" my-command this-command last-command) (setq my-command nil)) (add-hook 'window-scroll-functions-hook 'wsf-fn) ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Thanks, Keith From unknown Tue Aug 19 05:08:45 2025 MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) X-Loop: help-debbugs@gnu.org From: help-debbugs@gnu.org (GNU bug Tracking System) To: Keith David Bershatsky Subject: bug#19684: closed (Re: bug#19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs.) Message-ID: References: X-Gnu-PR-Message: they-closed 19684 X-Gnu-PR-Package: emacs X-Gnu-PR-Keywords: notabug Reply-To: 19684@debbugs.gnu.org Date: Tue, 01 Oct 2019 20:18:02 +0000 Content-Type: multipart/mixed; boundary="----------=_1569961082-11225-1" This is a multi-part message in MIME format... ------------=_1569961082-11225-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-funct= ions` hook runs. which was filed against the emacs package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 19684@debbugs.gnu.org. --=20 19684: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D19684 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1569961082-11225-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 19684-done) by debbugs.gnu.org; 1 Oct 2019 20:17:17 +0000 Received: from localhost ([127.0.0.1]:34889 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1iFOaD-0002jy-30 for submit@debbugs.gnu.org; Tue, 01 Oct 2019 16:17:17 -0400 Received: from mail-pf1-f180.google.com ([209.85.210.180]:36634) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1iFOaB-0002eo-AP for 19684-done@debbugs.gnu.org; Tue, 01 Oct 2019 16:17:15 -0400 Received: by mail-pf1-f180.google.com with SMTP id y22so8883599pfr.3 for <19684-done@debbugs.gnu.org>; Tue, 01 Oct 2019 13:17:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=pCOoDgIt8lc+fyTb6VyOWVFDk1mansRyQVyODX01l8g=; b=M+tE2lhl56rNFyk94CLQ3T/d2RsKMX/pQU55sIG7aorSPTR/OBmul2vWuq14Pr0bTH Q3yd2w7qJR6KAl1hrShSJcRiEjlz3gt8XErPaBQvpE1e1XsZEay4j2P0Ho58HiE+8eII O9Q109P/Bp6qH3dQaZKuepUqlfYri7GxekJNaQWWJDs58JhZRKvjubLuisHJkO5126Eq cTi9pECNe7+Gu27+8ve9FJAOaWjkmAf1oc6TMxXgqi3G1X5Py7IV7kJSmioCQE+AMjDw GdmG1KgLCBDuFFw3v76kpQTgx3wym7cd25ZdPQ1nGuDkf5elq4bGGvzFvrlR8PF4zYXb iMTw== X-Gm-Message-State: APjAAAWf5f47eI3AzfQf4DBpgGa1Y59I1Og+SpQz0jW8TNmPhkCptxCq 6KnoOjMYjyOAKhtxfD0xgJc5Igz8N8W4Nmz9API= X-Google-Smtp-Source: APXvYqxucnGxfc3SqdZCVqISOxoEIYcMt0IVwMxJy2BHGGw27oIV37n2Hh/d49EryVfvLBvDLjSX2aRmy/lcZBqh5oQ= X-Received: by 2002:a17:90a:cc08:: with SMTP id b8mr7516482pju.119.1569961029460; Tue, 01 Oct 2019 13:17:09 -0700 (PDT) MIME-Version: 1.0 From: Stefan Kangas Date: Tue, 1 Oct 2019 22:16:57 +0200 Message-ID: Subject: Re: bug#19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs. To: Stefan Monnier Content-Type: text/plain; charset="UTF-8" X-Spam-Score: 0.2 (/) X-Debbugs-Envelope-To: 19684-done Cc: Keith David Bershatsky , 19684-done@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -0.8 (/) Stefan Monnier writes: > tags 19684 notabug > thanks > >> 1. Expressly call `redisplay` at the tail end of the series of >> functions attached to the `post-command-hook`. >> Calling `redisplay` somehow prevents `this-command` from being >> reset to `nil` and the `window-scroll-functions` hook can then >> take advantage of the existing value of `this-command`. > > It's not that calling `redisplay' prevents it. It's that the normal > redisplay is run later (potentially much later if there are other things > pending), at a point which is not directly connected with the command, > hence this-command is not set any more because we're really not in the > process of running that command any more. This was already tagged notabug; I'm now also closing it. Best regards, Stefan Kangas ------------=_1569961082-11225-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 25 Jan 2015 07:20:09 +0000 Received: from localhost ([127.0.0.1]:55570 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFHUN-0001xj-Mk for submit@debbugs.gnu.org; Sun, 25 Jan 2015 02:20:08 -0500 Received: from eggs.gnu.org ([208.118.235.92]:53508) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1YFHUL-0001ww-8p for submit@debbugs.gnu.org; Sun, 25 Jan 2015 02:20:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFHUD-0007UI-Up for submit@debbugs.gnu.org; Sun, 25 Jan 2015 02:19:59 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:34682) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHUD-0007UE-S2 for submit@debbugs.gnu.org; Sun, 25 Jan 2015 02:19:57 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55230) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHUC-0002Uf-2H for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:19:57 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFHU7-0007Tq-1T for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:19:56 -0500 Received: from cobb.liquidweb.com ([50.28.13.150]:42442) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHU6-0007Sv-Pj for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:19:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lawlist.com; s=default; h=Content-Type:MIME-Version:Subject:To:From:Message-ID:Date; bh=M09rpbZ1wPl2b44TfPhuO0MWTjj+PV09Hu6EZ0DoLpA=; b=7f1snOoxb4rxuTkHPKRdrmcxnRlU82F57OGwTPTca9iwoyT/3VXH2i718uL/8rVSPPJxG2H5cvi9gRXs/O2qB2wqwjmvKEkYQuU+W9RFRLjBlY7gSfllxO1bj2v8FYlw; Received: from cpe-104-173-54-60.socal.res.rr.com ([104.173.54.60]:55593 helo=MP.local) by cobb.liquidweb.com with esmtp (Exim 4.82) (envelope-from ) id 1YFHU3-0008MU-8B for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:19:47 -0500 Date: Sat, 24 Jan 2015 23:19:48 -0800 Message-ID: From: Keith David Bershatsky To: bug-gnu-emacs@gnu.org Subject: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs. MIME-Version: 1.0 (generated by - "") Content-Type: text/plain; charset=US-ASCII X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cobb.liquidweb.com X-AntiAbuse: Original Domain - gnu.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lawlist.com X-Get-Message-Sender-Via: cobb.liquidweb.com: acl_c_relayhosts_text_entry: lawlist|lawlist.com X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.0 (-----) To the extent that a user wishes to use the value of `this-command` within a function attached to the `window-scroll-functions` hook, a workaround is needed because the default value is `nil`. In other words, something at the C source code level is setting the value to `nil` before the `window-scroll-functions` hook runs. There are two (2) workarounds that I am aware of. 1. Expressly call `redisplay` at the tail end of the series of functions attached to the `post-command-hook`. Calling `redisplay` somehow prevents `this-command` from being reset to `nil` and the `window-scroll-functions` hook can then take advantage of the existing value of `this-command`. 2. Create a separate variable -- e.g., `my-this-command` and set the value within a function attached to the `post-command-hook`. Like so: (setq my-this-command this-command). And, then use the value of `my-this-command` within the function attached to the `window-scroll-functions` hook. The most reliable test I have discovered to pinpoint when the `window-scroll-functions` hook will activate is by having the following code within a function attached to the `post-command-hook`: (pos-visible-in-window-p (point) (get-buffer-window (current-buffer) (selected-frame))). If the result is `t`, then the `window-scroll-functions` hook will be activating. I do not see a visual difference between either of the two workarounds mentioned above, even though I would expect to see a flicker on the screen with the first workaround. However, there is no flicker. The second workaround is probably a safer bet. Although this bug report has been submitted with Emacs Trunk from October 1, 2014; the behavior is the same with Emacs Trunk built on January 1, 2015. Thanks, Keith ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; In GNU Emacs 25.0.50.1 (x86_64-apple-darwin10.8.0, NS appkit-1038.36 Version 10.6.8 (Build 10K549)) of 2014-10-01 on MP.local Repository revision: 117996 dmantipov@yandex.ru-20141001132108-zdsxru2390mqyjlu Windowing system distributor `Apple', version 10.3.1038 Configured using: `configure --with-ns' Configured features: ACL LIBXML2 ZLIB Important settings: locale-coding-system: utf-8-unix Major mode: Fundamental Minor modes in effect: sd-mode: t sb-mode: t tb-mode: t shell-dirtrack-mode: t cm-mode: t frame-bufs-mode: t bc-mode: t ds-mode: t ml-mode: t Recent input: x r e p o r t - e m a c s - b u g Recent messages: Wrote /Users/HOME/.0.data/.0.emacs/.lock Load-path shadows: /Users/HOME/.0.data/.0.emacs/.0.wl/md4 hides /Users/HOME/.0.data/.0.emacs/Emacs_10_01_2014.app/Contents/Resources/lisp/md4 /Users/HOME/.0.data/.0.emacs/.0.wl/hex-util hides 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tramp-loaddefs trampver shell thingatpt time-stamp log-view log-edit message mml mml-sec mm-decode mm-bodies mm-encode gmm-utils mailheader pcvs-util add-log json help-mode grep compile find-lisp epa epg epg-config ediff-merg ediff-wind ediff-diff ediff-mult ediff-help ediff-init ediff-util ediff ert ewoc debug eieio-base diff-mode conf-mode autorevert filenotify lorg-calendar org-element lorg-search org-agenda context-menu dired-read-filename dired count-business-days lawlist-toodledo url-http tls url url-proxy url-privacy url-expand url-methods url-history mailcap url-auth url-cookie url-domsuf url-util url-parse auth-source eieio eieio-core password-cache url-gw url-vars lawlist-org lawlist-calendar org byte-opt bytecomp byte-compile cconv org-macro org-footnote org-pcomplete pcomplete org-list org-faces org-entities noutline outline org-version ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint ob-core ob-eval org-compat org-macs org-loaddefs 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czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote make-network-process cocoa ns multi-tty emacs) Memory information: ((conses 16 1229677 95833) (symbols 48 61646 0) (miscs 40 105 150) (strings 32 132512 13095) (string-bytes 1 4616193) (vectors 16 33496) (vector-slots 8 697599 22896) (floats 8 942 252) (intervals 56 4202 0) (buffers 976 11)) ------------=_1569961082-11225-1--