Clicking on partially visible lines fails

[David Kastrup]

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

I had gnus display a mouse-highlighted line (a URL from browse-url)
partially at the bottom of its window.  If I click with middle mouse
key on it, the window gets recentered while I hold the mouse key
pressed.  If I release it, the window returns into its old position
(cursor in top row) and nothing happens, presumably because the click
was not registered on the line itself, but on the magically
recentered version.

That is a nuisance.  Recentering of even partially visible click
targets should only happen if window-point moves there, but not at
the time of the click.  From the moment I hold down a key until it
gets released, the displayed window portion should not change, with
the sole exception of scrolling when dragging at the edge of the
screen.

In GNU Emacs 21.3.50.23 (i686-pc-linux-gnu, GTK+ Version 2.2.1)
 of 2004-04-23 on lola.goethe.zz
configured using `configure '--prefix=/usr/local/emacs-21' '--with-gtk''

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_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  auto-compression-mode: t
  desktop-save-mode: t
  display-time-mode: t
  iswitchb-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  unify-8859-on-encoding-mode: t
  line-number-mode: t

Recent input:
M-x g n u s <return> n <help-echo> <help-echo> M-x 
g n u s <return> n <help-echo> M-x g n u s <return> 
n n <return> 4 <return> n SPC n q <return> 3 <return> 
n SPC q SPC n n n n n n n n n SPC n n j <up> <return> 
j <up> <up> <return> <return> n SPC q j <up> <up> <up> 
<up> <return> <return> n SPC <backspace> <help-echo> 
<down-mouse-2> <mouse-2> <help-echo> <down-mouse-2> 
<mouse-2> <down-mouse-2> <mouse-2> <down-mouse-2> <mouse-2> 
M-x r e p o r t - e m a c s - b u <tab> <return>

Recent messages:
Scoring...done
Generating summary...done
Processing kill file /home/dak/News/de.sci.mathematik.KILL...done
No more unread newsgroups
Retrieving newsgroup: sci.math...
Fetching headers for sci.math...done
Scoring...done
Generating summary...done
Processing kill file /home/dak/News/sci.math.KILL...done
Loading emacsbug...done

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum