updateCache applies worldAlpha problem

[mcolman]

Hi, I'm having an issue where the updateCache method is applying worldAlpha. It looks to be a PIXI bug and possibly fixed in later versions, see https://github.com/pixijs/pixi.js/issues/2386

Is anyone having the same issue? Found a workaround??

I'm using Phaser 2.5.0.

Example here https://codepen.io/mattcolman/pen/wWqopb

Thanks!

[mcolman]

found a workaround...it's makes my code ugly, but something like this works.

```

parent.removeChild(child) // remove child so the display object's worldAlpha will be 1

child.updateCache()

parent.addChild(child) // add the child back

```

[drhayes]

Is the parent a Group? If so, you should probably use "add" instead of "addChild"... but maybe that won't fix this problem?

[mcolman]

parent is a Group. I wasn't aware of 'add', but looking at the source code it calls 'addChild' internally anyway. It's basically the same thing with some bonus functionality.