dojo._Animation: onEnd fires twice and the delay is not respected

[dante]

when doing advanced animations, dojo.fx.combine somehow causes FF to ignore any delay: parameters.

the effect can be seen here: http://dojotoolkit.org/~dante/dojo.moj.oe/mojo.html

each of the ball nodes fades in on approx ~300ms delay higher than the previous node, and dojox.fx.combine(anims).play()'d ... in Safari and IE7, the effect is the desired result, but in FF, all the animations play in unison, regardless of delay: parameters. it is using the delay: value of the first animation only.

also interesting to note, dojox.fx.combine(anims).play(50) override's any delay: param set on that first animation, and uses delay:50 on all animations in Safari and IE7 ...

[dante]

(In [12478]) refs #5539 - it doesn't actually appear to be broken (the ticket claim) though new unit test introduce new issue: onEnd is fired twice (or more?) for chained and combined animations. unit tests pass, but you will see a console.warn() you should otherwise not.

[dante]

this seems to be working, but leaving open to address onEnd issue noticed.

[Eugene Lazutkin]

(In [12826]) fx: Fixes #5539. !strict