Comment 11 for bug 1646257

Reverting commit r1620 fixes this bug for me.

The attached patch, which doesn't revert r1620 but instead sets the 'position-set' property only when actually setting the 'position' property, fixes it too.

Not sure what bug r1620 was trying to solve. I have read bug 1494979 and I can't reproduce the bug when going to r1619... but I'm not sure I understand it, or have the same config to reproduce.

Stephen, can you see if my patch doesn't regress the bug you fixed in bug 1494979 ?