Button highlight not cleared after onLongClick
<p>I have an onLongClick event on a button but after a long click, the coloured highlight is not removed.
I also have an onClick event on the same button which behaves as expected.</p>

<p>Put another way, the button is coloured as you start the click, and the colour should be removed when you release the click. For onClick it works ok, but onLongClick the highlight is not removed.</p>

<p>This is the same whether onLongClick returns true or false.</p>
