SWF issue with V9 and scale9Grid (9-slice)

Haxe
#1

We are in process of converting from 8.9.7 to 9.0.2 (using SWF 3.0.2 in either case.) When executing this line in the 9.0.2 version:

avamc = Assets.getMovieClip("AvatarDisplay_art.swf:ava");

there’s an exception. The first few lines of the call stack are:

Uncaught TypeError: shape.get_graphics is not a function
at swf_exporters_animate_AnimateTimeline.enterFrame (AnimateTimeline.hx:366:36)
at swf_exporters_animate_AnimateTimeline.attachMovieClip (AnimateTimeline.hx:248:3)
at swf_exporters_animate_AnimateTimeline.__attachMovieClip (Timeline.hx:103:3)

The AnimateTimeline code is crashing in the copyFrom() routine below.

// TODO: How to tell if shapes are for a scale9Grid clip?
if (__movieClip.scale9Grid != null)
{
    __movieClip.graphics.clear();
    if (currentInstances.length > 0)
    {
        var shape:Shape = cast currentInstances[0].displayObject;
        __movieClip.graphics.copyFrom(shape.graphics);
    }
}

The reason it’s crashing is that it’s casting a Text item and not a Shape item. The MovieClip it’s working on has a 9-slice defined and contains just two children, a text and a shape. If I edit the library to trap that and use currentInstances[1] instead, it works. The code preceding this has done a sort on currentInstances, but it’s not clear to me why it’s believed that will guarantee the 0-th element will then be a shape.

In any case, we worked around this by making a new SWF where the two cases like this are not 9-slice anymore, and we’re up and running again. I didn’t see anything related in the fora. I don’t know whether this is an OFL bug, or some subtle violation we’ve done, but it seems worth mentioning this issue.

#2

This may not the correct solution in the end, but it may be a temporary improvement to check the type of the first item in currentInstances to be sure it’s what we expect it to be.

var shape:Shape = Std.downcast(currentInstances[0].displayObject, Shape);
if (shape != null)
{
    __movieClip.graphics.copyFrom(shape.graphics);
}
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