problems on play [laya.ui.Clip]

[HongMok]

1. [onDisplay()] does not remember [toIndex]
   replace play() with playFromCurr(),
   playFromCurr() does not modify toIndex
   https://github.com/layabox/layaair/blob/d1811049e17fc73915ae014f7e25dfbd7ae889cb/bin/as/libs/src/laya/ui/Clip.as#L182-L190

2.[play()] does not remember [fromIndex]
add this.fromIndex = from, set index = fromIndex when index > toIndex;
https://github.com/layabox/layaair/blob/d1811049e17fc73915ae014f7e25dfbd7ae889cb/bin/as/libs/src/laya/ui/Clip.as#L429-L443

3. [ play(from, to, autoLoop), make autoLoop is optional ]
   play() is auto loop, but play(from, to) not.
   sometimes we need an autoLoop play(from, to)
   https://github.com/layabox/layaair/blob/d1811049e17fc73915ae014f7e25dfbd7ae889cb/bin/as/libs/src/laya/ui/Clip.as#L445-L455

[aaronswiftming]

Thanks for your advices.
It designed need manual record like ‘ currentIndex = m_clip.index; ”
Then use [play(currentIndex, to);]

The play(from,to, loop) auto loop you can change the source code of the engine. Make it functional.