clicking scroll-bar thumb scrolls buffer up slightly

[Drew Adams]

emacs -q

In any buffer, move the scroll-bar thumb down a bit so it is not at
the very top. Click or press (mouse-1) on the scroll-bar thumb: the
buffer is scrolled up slightly.

The buffer should _not_ be scrolled in any way just because you click
or press mouse-1 on the thumb. Since this annoying effect happens even
when you press mouse-1 (without releasing it) on the thumb in
preparation for dragging the thumb, this is particularly disorienting.


In GNU Emacs 21.3.50.1 (i386-mingw-nt5.1.2600)
 of 2004-07-26 on BERATUNG4
configured using `configure --with-gcc
(3.3) --cflags -I../../jpeg-6b-1/include -I../../libpng-1.2.4-1/include -I..
/../tiff-3.5.7/include -I../../xpm-nox-4.2.0/include -I../../zlib-1.1.4-1/in
clude'