From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Keith David Bershatsky Newsgroups: gmane.emacs.bugs Subject: bug#19684: 25.0.50; `this-command` is set to `nil` before `window-scroll-functions` hook runs. Date: Sat, 24 Jan 2015 23:19:48 -0800 Message-ID: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (generated by - "") Content-Type: text/plain; charset=US-ASCII X-Trace: ger.gmane.org 1422170482 30926 80.91.229.3 (25 Jan 2015 07:21:22 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 25 Jan 2015 07:21:22 +0000 (UTC) To: 19684@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Jan 25 08:21:19 2015 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YFHVR-0003R6-Bl for geb-bug-gnu-emacs@m.gmane.org; Sun, 25 Jan 2015 08:21:13 +0100 Original-Received: from localhost ([::1]:36987 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHVQ-0002j7-MZ for geb-bug-gnu-emacs@m.gmane.org; Sun, 25 Jan 2015 02:21:12 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55361) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHVL-0002j2-QG for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:21:09 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YFHVG-0007ux-If for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:21:07 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:36878) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YFHVG-0007ut-Ek for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:21:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1YFHVG-0001z1-7R for bug-gnu-emacs@gnu.org; Sun, 25 Jan 2015 02:21:02 -0500 X-Loop: help-debbugs@gnu.org 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: X-Debbugs-Original-To: bug-gnu-emacs@gnu.org Original-Received: via spool by submit@debbugs.gnu.org id=B.14221704097552 (code B ref -1); Sun, 25 Jan 2015 07:21:02 +0000 Original-Received: (at submit) by debbugs.gnu.org; 25 Jan 2015 07:20:09 +0000 Original-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 Original-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 Original-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 Original-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 Original-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 Original-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 Original-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; Original-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 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-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:98696 Archived-At: 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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