GNU bug report logs - #349
show-paren-mode overlay extending onto new text

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: bug#349: marked as done (show-paren-mode overlay extending onto 
 new text)

[Message part 1 (text/plain, inline)]

Your message dated Tue, 10 Jun 2008 12:20:19 -0400
with message-id <jwvskvltgb2.fsf-monnier+emacsbugreports <at> gnu.org>
and subject line Re: show-paren-mode overlay extending onto new text
has caused the Emacs bug report #349,
regarding show-paren-mode overlay extending onto new text
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact don <at> donarmstrong.com
immediately.)


-- 
349: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=349
Emacs Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Kevin Ryde <user42 <at> zip.com.au>
To: bug-gnu-emacs <at> gnu.org
Subject: show-paren-mode overlay extending onto new text
Date: Mon, 02 Jun 2008 11:46:20 +1000

In show-paren-mode, when point is after a closing paren so it and the
opener are highlighted, sometimes newly inserted text is covered with
the paren colour too, for a little while.

This doesn't happen all the time, but I've noticed in particular in
program output from M-x compile.  So from "emacs -Q",

    M-x show-paren-mode
    M-x compile
    echo -n '(hello)'; sleep 6; yes
    C-x o    # to *compilation* buffer
    M->      # go to end of buffer

    => the (hello) parens are highlighted

    => but then the output of "yes" is highlighted too

The "sleep 6" gives you a chance to switch to the compilation buffer,
the "echo -n" is so there's no trailing newline in the buffer yet.

An "echo" like this is of course a contrivance, but I've struck the
effect in real program output when switching to the buffer at a random
point or when a close paren is a genuine last bit of its output so far.

I guess for most insertions the timer or whatever gets a chance to reset
or hide the overlay, but for heavy running compile output maybe that
doesn't happen.  I wondered if the make-overlay in show-paren-function
might have the "rear-advance" arg nil, unless there's ever a time it
ought to extend.



In GNU Emacs 22.2.1 (i486-pc-linux-gnu, GTK+ Version 2.12.9)
 of 2008-04-27 on raven, modified by Debian
configured using `configure  '--build=i486-linux-gnu' '--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' '--enable-locallisppath=/etc/emacs22:/etc/emacs:/usr/local/share/emacs/22.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/22.2/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/22.2/leim' '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

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: en_AU
  locale-coding-system: iso-8859-1
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  show-paren-mode: t
  encoded-kbd-mode: t
  file-name-shadow-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: 349-done <at> debbugs.gnu.org
Subject: Re: show-paren-mode overlay extending onto new text
Date: Tue, 10 Jun 2008 12:20:19 -0400

I've installed a change which fixes this problem for `compile' buffers
as well as a few others (e.g. comint).  The underlying problem is still
present and currently unavoidable, so it may show up anywhere where
insert-before-markers is used, but the new window-point-insertion-type
should reduce the need for insert-before-markers.


        Stefan

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