header-line and mode-line leave residue with certain fonts

[Stephen Berman]

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


Start Emacs under X11 with -q -no-site-file, then type `M-x
set-frame-font RET' and at the prompt type
`-misc-fixed-medium-r-normal--13-120-75-75-c-70-iso8859-1 RET'.  Now
type `M-x ruler-mode' twice, first to display and then hide the ruler.
You will now see a vertical line the height of the ruler in the upper
left margin, between the scroll bar and the fringe.  Similarly, typing
`M-: (setq mode-line-format nil)' leaves a vertical line the height of
the mode line in the lower left margin, between the scroll bar and the
fringe.  Further observations:

- These residues of the mode line and header line (if that's what they
  are) disappear when the frame is redisplayed (e.g. by typing `C-l').
- Unsplitting a vertically split frame also leaves such residues.
- I've also observed residues of the header lines in tabbar-mode and
  w3m-mode, but the Info header line appears to leave either a very
  faint residue or none, on my monitor with the default colors. 
- The residues appear only with certain fontsets.  I haven't tried all
  the fonts on my system, but I've only observed the residues with
  fonts with a width field of 70.
- The residues appear only when the scroll bar is on the left.
- The residues appear whether or not there is a left fringe.
- The residues don't appear in the released Emacs 21.3.1, nor do I
  recall seeing them in CVS Emacs with the Xaw3d scroll bars
  (currently I only have the GTK build of CVS Emacs available).



In GNU Emacs 21.3.50.2 (i686-pc-linux-gnu, GTK+ Version 2.2.3)
 of 2004-02-25 on feldmann
configured using `configure '--with-x-toolkit=gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: C
  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_US
  locale-coding-system: iso-latin-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
  tabbar-mode: t
  which-function-mode: t
  auto-compression-mode: t
  display-time-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  column-number-mode: t
  line-number-mode: t

Recent input:
e <tab> l i <tab> s <tab> / f o n <tab> s <tab> <backspace> 
<C-backspace> i n t <tab> f o <tab> <return> <next> 
C-s f o n t s e t - 1 <next> <prior> <prior> <prior> 
C-x k <return> <next> <next> <next> <next> <down-mouse-5> 
<mouse-5> <double-down-mouse-5> <double-mouse-5> <help-echo> 
<menu-bar> <buffer> "*Group*" M-x t a b b <tab> m <tab> 
<return> <up> <up> <up> <up> <up> <return> <down> <return> 
Q y M-x e m a <tab> b <tab> <backspace> r <tab> <M-backspace> 
<M-backspace> b u g <tab> <M-backspace> r p <backspace> 
e p o <tab> r <tab> <return>

Recent messages:
(iconify-frame (#<frame address@hidden 0x85ed278>))
(make-frame-visible (#<frame address@hidden 0x85ed278>))
Tabbar mode enabled
Retrieving newsgroup: nndraft:drafts...
Loading gnus-draft...done
Fetching headers for nndraft:drafts...done
Generating summary...done
Discard changes to this group and exit? (y or n) 
Making completion list...
Loading emacsbug...done