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

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 [email protected] 
>> 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