This looks a little more "sane", and more closely matches what iOS does
with it's filter chips. This has to manually track which filters were
"just-deselected" and move those even higher up the z stack to ensure
they appear above even when sliding right. This is because the order is
determined by the position left-to-right of the _final_ destination of
the chip. In this case we want anything that's either currently
selected, or was selected and is still fading out to appear on top.
Signed-off-by: Joe Groocock <me@frebib.net>
102025f1a6