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cursor-type 'bar should invert underlying text

From: Hallvard B Furuseth
Subject: cursor-type 'bar should invert underlying text
Date: Fri, 23 Nov 2001 13:41:37 +0100

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
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Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

In GNU Emacs 21.1.1 (sparc-sun-solaris2.8, X toolkit, Xaw3d scroll bars)
 of 2001-10-26 on bombur.uio.no
configured using `configure  --quiet --prefix=/usit/bombur/hbf'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: iso_8859_1
  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: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

The "Bar" cursor type hides parts of the character beneath it.  To
illustrate, try a wide bar:

(progn (setq cursor-type '(bar . 4))
       (set-cursor-color "red")
       (blink-cursor-mode -1)

Now move the cursor over some text.

I think a bar cursor should invert text below it the same way as the
block cursor.  Well, the same way as a block cursor _should_ invert,
since that's a bit buggy as this bug report says:
    From: address@hidden (Hallvard B Furuseth)
    Subject: black-on-black cursor with isearch-backwards
    Date: Tue, 30 Oct 2001 12:10:15 +0100
    Message-ID: <address@hidden>

Recent input:
x b l i n <tab> k <tab> <backspace> c u <tab> <return> 
( s e t e q SPC c u <backspace> <backspace> <backspace> 
<backspace> <backspace> q SPC c u r s o r - t y p e 
SPC ' b l c <backspace> o c k ) C-j C-p C-n C-p C-n 
C-p C-e C-p C-p C-e C-b C-n C-b C-n C-n C-b C-b C-M-b 
C-f ( b a r SPC . SPC 6 M-d C-e ) C-j C-p C-f <escape> 
x C-g <escape> x r e p o r t - e m <tab> C-f <retu

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