Fade animations on zoom change

[tmcw]

that was ported from another todo list. it applies to double-click zooming - in webgl there was a timed fade animation rather than 1->0 opacity change

[incanus]

@tmcw do you mean features fading in and out?

[incanus]

Can you clarify this @tmcw?

[tmcw]

do you mean features fading in and out?

Yep, this: so labels that are visible at one zoom level but not visible at +1 will display during the transition and then fade out.

[brunoabinader]

@tmcw I believe this was solved in #1548 - can you please confirm?