From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Joe Wells Newsgroups: gmane.emacs.devel Subject: Re: Emacs 21.2 display bugs: variables: cursor-type; properties: display, before-string, after-string, invisible, intangible Date: 31 May 2002 09:45:27 +0100 Sender: emacs-devel-admin@gnu.org Message-ID: References: <200205262225.g4QMPcJ06451@aztec.santafe.edu> NNTP-Posting-Host: localhost.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: main.gmane.org 1022836472 27434 127.0.0.1 (31 May 2002 09:14:32 GMT) X-Complaints-To: usenet@main.gmane.org NNTP-Posting-Date: Fri, 31 May 2002 09:14:32 +0000 (UTC) Return-path: Original-Received: from quimby.gnus.org ([80.91.224.244]) by main.gmane.org with esmtp (Exim 3.33 #1 (Debian)) id 17DiUS-00078M-00 for ; Fri, 31 May 2002 11:14:32 +0200 Original-Received: from fencepost.gnu.org ([199.232.76.164]) by quimby.gnus.org with esmtp (Exim 3.12 #1 (Debian)) id 17Dine-0005PX-00 for ; Fri, 31 May 2002 11:34:22 +0200 Original-Received: from localhost ([127.0.0.1] helo=fencepost.gnu.org) by fencepost.gnu.org with esmtp (Exim 3.34 #1 (Debian)) id 17DiTQ-0000Fx-00; Fri, 31 May 2002 05:13:28 -0400 Original-Received: from izanami.cee.hw.ac.uk ([137.195.52.9]) by fencepost.gnu.org with esmtp (Exim 3.34 #1 (Debian)) id 17Di2K-0005nf-00 for ; Fri, 31 May 2002 04:45:28 -0400 Original-Received: from lxjbw ([137.195.52.90] helo=localhost.localdomain ident=root) by izanami.cee.hw.ac.uk with esmtp (Exim 3.33 #1) id 17Di2J-0005ua-00 for emacs-devel@gnu.org; Fri, 31 May 2002 09:45:27 +0100 Original-Received: (from jbw@localhost) by localhost.localdomain (8.11.6/8.9.3) id g4V8jRS02420; Fri, 31 May 2002 09:45:27 +0100 X-Authentication-Warning: localhost.localdomain: jbw set sender to jbw@izanami.cee.hw.ac.uk using -f Original-To: emacs-devel@gnu.org In-Reply-To: <200205262225.g4QMPcJ06451@aztec.santafe.edu> Original-Lines: 196 User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 Errors-To: emacs-devel-admin@gnu.org X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.0.9 Precedence: bulk List-Help: List-Post: List-Subscribe: , List-Id: Emacs development discussions. List-Unsubscribe: , List-Archive: Xref: main.gmane.org gmane.emacs.devel:4527 X-Report-Spam: http://spam.gmane.org/gmane.emacs.devel:4527 Richard Stallman writes: > ;; * A display property of "" (the empty string) on any character in > ;; the buffer causes a truly wacky event. The buffer is effectively > ;; partitioned into two portions, that before the first such > ;; character, and that after... > > Does this still happen in the CVS version? > Likewise for the other display property bugs. All of the other bugs I have reported still exist in the CVS version as of 2002-05-29 (Wednesday). some of them actually got a bit worse. So you don't have to find the original message, I am including the updated bug report below. -- Joe ---------------------------------------------------------------------- ;; Should be sent to (but hasn't): bug-gnu-emacs@gnu.org, emacs-pretest-bug@gnu.org ;; Actually sent to: emacs-devel@gnu.org ;; Subject: Emacs 21.3 (CVS) display bugs: properties: display, before-string, after-string, invisible, intangible ;; Emacs 21.3 (CVS) display bugs ;; affected overlay properties: display, before-string, after-string, invisible, intangible ;; bugs reported by: Joe Wells () ;; In GNU Emacs 21.3.50.1 (i686-pc-linux-gnu, X toolkit) ;; of 2002-05-29 on lxjbw ;; Important settings: ;; value of $LC_ALL: nil ;; value of $LC_COLLATE: nil ;; value of $LC_CTYPE: nil ;; value of $LC_MESSAGES: nil ;; value of $LC_MONETARY: nil ;; value of $LC_NUMERIC: nil ;; value of $LC_TIME: nil ;; value of $LANG: nil ;; locale-coding-system: nil ;; default-enable-multibyte-characters: t ;; Test cases to reproduce the buggy behavior are supplied for all ;; bugs reported in this message. ;; * A display property of "" (the empty string) on any character in ;; the buffer causes a truly wacky event. The buffer is effectively ;; partitioned into two portions, that before the first such ;; character, and that after. Only the first portion will be ;; displayed, even when point is in the second portion. (If ;; scroll-step is set to a number greater than 0, then sometimes the ;; second portion will be displayed when point is in it.) ;; Furthermore, subsequent display property values appear to be ;; ignored. There are 3 test cases for this bug. ;; *** Verified 21.3 (progn (kill-buffer (get-buffer-create "test")) (set-buffer (get-buffer-create "test")) (insert "ABCDEFGH") (let ((o (make-overlay 3 4))) ;; covering the "C" (overlay-put o 'display "")) (let ((o (make-overlay 7 8))) ;; covering the "F" (overlay-put o 'display "")) (display-buffer (current-buffer))) ;; *** Verified 21.3 (progn (kill-buffer (get-buffer-create "test")) (set-buffer (get-buffer-create "test")) (insert "ABCDEFGH") (let ((o (make-overlay 3 4))) ;; covering the "C" (overlay-put o 'display "")) (let ((o (make-overlay 7 8))) ;; covering the "F" (overlay-put o 'display "")) (goto-char (point-min)) (display-buffer (current-buffer))) ;; *** Verified 21.3 (progn (kill-buffer (get-buffer-create "test")) (set-buffer (get-buffer-create "test")) (insert "ABCDEFGH") (let ((o (make-overlay 3 4))) ;; covering the "C" (overlay-put o 'display "")) (let ((o (make-overlay 7 8))) ;; covering the "F" (overlay-put o 'display "Z")) (display-buffer (current-buffer))) ;; * The "specified spaces" form of display specification causes wacky ;; cursor problems when the space is very small. When point is just ;; before the first character of a range having such a specification, ;; the cursor is not displayed when the buffer's window is selected. ;; It does not matter whether the cursor is the default box cursor or ;; the bar cursor. When the buffer's window is not selected, the ;; cursor is displayed as a hollow box that extends all the way to the ;; right edge of the window. There are various other display things ;; that go wrong in this situation, too many to list. ;; *** Verified 21.3 (progn (kill-buffer (get-buffer-create "test")) (set-buffer (get-buffer-create "test")) (insert "ABCD") (goto-char 2) ;; between A and B (let ((o (make-overlay 2 4))) ;; covering the "BC" (overlay-put o 'display '(space :width 0.01))) (display-buffer (current-buffer))) ;; * A string-valued display property on a range of characters causes ;; cursor problems. If point is just before all of the characters ;; with the string-valued display property, the cursor is displayed ;; _after_ the string which is displayed instead of the characters. ;; *** Verified 21.3 (progn (kill-buffer (get-buffer-create "test")) (set-buffer (get-buffer-create "test")) (insert "ABC") (let ((o (make-overlay 2 3))) ;; covering the B (overlay-put o 'display "Y")) (goto-char 2) ;; between A and B (display-buffer (current-buffer)) (what-cursor-position) ;; shows point is _before_ the B ) ;; * A before-string property on a range of characters causes cursor ;; problems. If point is just before all of the characters with the ;; before-string property, the cursor is displayed _after_ the string ;; which is the value of the before-string property. ;; *** Verified 21.3 (progn (kill-buffer (get-buffer-create "test")) (set-buffer (get-buffer-create "test")) (insert "AB") (let ((o (make-overlay 2 3))) ;; covering the B (overlay-put o 'before-string "Y")) (goto-char 2) ;; between A and B (display-buffer (current-buffer)) (what-cursor-position) ;; shows point is _before_ the B ) ;; * An after-string and invisible property on a range of characters ;; causes cursor problems. If point is just before all of the ;; characters with the after-string and non-nil invisible property, ;; the cursor is displayed _after_ the string which is the value of ;; the after-string property. ;; *** Verified 21.3 (progn (kill-buffer (get-buffer-create "test")) (set-buffer (get-buffer-create "test")) (insert "AB") (let ((o (make-overlay 2 3))) ;; covering the B (overlay-put o 'after-string "Y") (overlay-put o 'invisible t)) (goto-char 2) ;; between A and B (display-buffer (current-buffer)) (what-cursor-position) ;; shows point is _before_ the B ) ;; * previous-line fails if there is no legal spot on the previous ;; line to move to. However, backward-char works fine. The next-line ;; function also has trouble in the buffer created by the test case. ;; (This is a change from my previous bug report for Emacs 21.2, where ;; I did not encounter any trouble with next-line.) ;; *** Verified 21.3, next-line now also has trouble (progn (kill-buffer (get-buffer-create "test")) ;; The following subexpression is necessary to exhibit the bug ;; reliably. Otherwise, the test case listed just above tends to ;; prevent the bug from appearing. (progn (delete-other-windows) (sit-for 0)) (set-buffer (get-buffer-create "test")) (insert "A\nB\nC\nD\nE") (let ((o (make-overlay 3 8))) ;; covering the "B\nC\nD" (overlay-put o 'intangible t)) (goto-char 8) (previous-line 1) (display-buffer (current-buffer)) (what-cursor-position) ;; shows point has not moved from 8 ) ;; * Column numbers as used by previous-line and next-line have ;; surprising (to the naive user) effects when overlay or text ;; properties are used which cause additional characters to be ;; displayed or prevent characters in the buffer from being displayed. ;; Strictly speaking, this may not be a bug, but it is highly ;; undesirable behavior. There should be a way to have motion to a ;; particular column based on what is displayed rather than on what is ;; in the buffer.