[Xmonad] darcs patch: clear out motion events when processing one motion event.

[Spencer Janssen]

On Sunday 19 August 2007 19:26:53 David Roundy wrote:
> On my laptop anyhow (over six years old) this is completely necesary for
> adequate performance when something expensive is being done in the drag
> loop.  And it's harmless, so far as I can tell.
>
> David
>
> Sun Aug 19 17:23:51 PDT 2007  David Roundy <droundy at darcs.net>
>   * clear out motion events when processing one motion event.
>   This is important if the hook is slow (e.g. try adding "float w"
>   to the window-dragging hook), as it allows xmonad to keep up with
>   the motion of the mouse.

Applied, thanks.

IIRC, we used to do this, perhaps it was removed in the recent dragging
refactor?