bug#5177: 23.1.90; scrollbar thumb stops working after being dragged

[Ken Brown]

On 12/10/2009 2:31 PM, Jan Djärv wrote:
> Ken Brown skrev:
> > Please write in English if possible, because the Emacs maintainers
> > usually do not have translators to read other languages for them.
> >
> > Your bug report will be posted to the emacs-pretest-bug@xxxxxxx 
> > mailing list.
> >
> > Please describe exactly what actions triggered the bug
> > and the precise symptoms of the bug.  If you can, give
> > a recipe starting from `emacs -Q':
> >
> > 1. Start the Gtk+ build of emacs.
> > 2. Visit a file too big to fit in the window.
> > 3. Drag the (vertical) scrollbar thumb.
> > 4. Scroll through the buffer using the mouse wheel or keystrokes.
> >
> > The scrollbar thumb stays fixed and no longer shows the relative
> > position in the buffer.  Clicking in an empty area of the scrollbar
> > restores the correct behavior.
>
> This does not happen for me.  Must be Cygwin-specific.

Angelo Graziosi told me he has observed similar behavior in Kubuntu. 
Could it be related to the Gtk+ version?  My Cygwin build uses version 
2.18.3.

Ken