Display problem with 21.3.1 on windows xp with Courier New font

Display problem with 21.3.1 on windows xp with Courier New font

[Robert Mecklenburg]

[ATTACHMENT c:/temp/screen-shot.PNG, image/png]
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In GNU Emacs 21.3.1 (i386-msvc-nt5.1.2600)
 of 2003-03-27 on buffy
configured using `configure --with-msvc (12.00)'
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: ENU
  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:

I'm using the frame parameter:

(font . "-*-Courier New-*-r-*-*-12-120-75-75-M-70-*-*")

and get display artifacts when scrolling.  Specifically, I have a
*compilation* window:

(setq special-display-buffer-names
      '(
	("*compilation*" (top . 0) (left . 28) (width . 110) (height . 35))
	...

which is often partially obscured by other (native windows) programs.
When the *compilation* buffer scrolls parts of the overlapping window
(say Internet Explorer) are "bit blitted" along with the scrolled
text.  This is hard to describe (obviously), so I'm including a screen
shot.  I apologize in advance if this is poor etiquette.

The *compilation* frame is in the upper left-hand corner and is the
result of scrolling with the IE window on top.  This problem does not
occur (I believe) if a more normal 6x13 font is used.


Recent input:
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-l C-n C-x o C-x 1 C-l <prior> <prior> <prior> 
<prior> <prior> <next> <prior> <prior> <help-echo> 
<down-mouse-1> <mouse-movement> <mouse-1> C-x b * s 
c SPC <return> M-> <return> <return> ( p p SPC ( f 
i l <backspace> <backspace> r a m e - p a r a m e t 
e r s e <backspace> <backspace> s SPC n i l ) ) C-j 
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-l 
<down-mouse-1> <mouse-movement> <mouse-movement> <mouse-1> 
<menu-bar> <help-menu> <report-emacs-bug>

Recent messages:
Parsing error messages...done.
Decoding MIME message... done
Decoding MIME message... done
Mark set
<<< Press Return to bury the buffer list >>>

Auto-saving...done
Auto-saving...done
Mark set
Loading emacsbug...done


-- 
Robert