From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ken Goldman Newsgroups: gmane.emacs.help Subject: Re: Refresh display after changing variable Date: Wed, 4 Aug 2021 16:17:21 -0400 Message-ID: <3baa4a94-78a6-9e23-8606-5fc3ca7ee382@us.ibm.com> References: <83k0l3n5hf.fsf@gnu.org> <83h7g7my8k.fsf@gnu.org> <875ywny392.fsf@web.de> <080b7d73-e4c8-eaf4-fc92-60f28bee288f@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="17115"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Aug 04 22:18:34 2021 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 1mBNLV-0004EE-QD for geh-help-gnu-emacs@m.gmane-mx.org; 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envelope-from=kgoldman@us.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.132, RCVD_IN_MSPIKE_H2=-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: 2.1.23 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" Xref: news.gmane.io gmane.emacs.help:132363 Archived-At: On 8/3/2021 1:00 PM, 2QdxY4RzWzUUiLuE@potatochowder.com wrote: > On 2021-08-03 at 11:42:45 -0400, > Ken Goldman wrote: > >> On 8/2/2021 5:26 PM, 2QdxY4RzWzUUiLuE@potatochowder.com wrote: >>> On 2021-08-02 at 22:56:41 +0200, >>> Michael Heerdegen wrote: >>> >>>> Eli Zaretskii writes: >>>> >>>>>> From: Ken Goldman >>>>>> Date: Mon, 2 Aug 2021 15:36:01 -0400 >>>>>> >>>>>>> (defun kg-toggle-whitespace-line-column () >>>>>>> "Toggle whitespace line column between 80 and 101" >>>>>>> (interactive) >>>>>>> (setq whitespace-line-column (if (= whitespace-line-column >>>>>>> 80) 101 80)) >>>>>>> (whitespace-mode 1)) >>> >>> FWIW, I have the following snippet in a function I wrote to change >>> tab-width: >>> >>> (let ((w (get-buffer-window (current-buffer)))) >>> (set-window-start w (window-start w))) >>> >>> and a note that I stole that snippet from scroll-bar-maybe-window-start >>> in scroll-bar.el. That function doesn't exist anymore (in Emacs 27.2), >>> but scroll-bar-set-window-start in scroll-bar.el does end as follows: >>> >>> (set-window-start window (point)))))) >>> >> That line, in the function, yields >> >> kg-toggle-whitespace-line-column: Symbol’s value as variable is void: window > > Yeah, sorry; window (the variable) is extracted near the beginning of > scroll-bar-set-window-start from one of a piece of the scroll bar event > that triggered the function call. > > My point was that current Emacs code uses set-window-start to force a > redraw. Try something like this: > > (set-window-start (get-buffer-window) (point)) > > (There might be simpler ways to get the current window, and I'm sure > someone will point them out to me, but that should work as a replacement > for your (whitespace-mode 1)). That scrolls the buffer so that the cursor is at the top of the window. However, it does not redo the colors. So far, revert-buffer is the only function that works.