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TreeItem with undefined CollapsibleState still shows triangle expander #43608

@ejizba

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@ejizba

We started noticing this bug on insiders a few days ago. We haven't changed our TreeDataProvider, but now even leaf nodes have the triangle expander thing.

Before:
screen shot 2018-02-13 at 10 49 35 am

Now:
screen shot 2018-02-13 at 10 50 23 am

@sandy081 I'm guessing it might have to do with the change to hasChildren in this commit: 125ac04#diff-094f2529578f3d0493f637a194e2687bR339

VS Code version: Code - Insiders 1.21.0-insider (00f2d8e, 2018-02-13T06:08:48.197Z)
OS version: Darwin x64 17.4.0

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