bug#51343: 27.2; Xaw3d scrollbar thumb doesn't update while dragged

[Eli Zaretskii]

> Date: Sat, 23 Oct 2021 15:32:48 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Previously, in an Emacs built with Xaw3d scroll bars, the thumb
> proportion would update as the scrollbar was dragged.  Now it doesn't
> update until the scrollbar is released, and something that makes the
> scrollbar position change happens.

Could you please bisect to find the commit which changed that?

Thanks.