How to expand all TreeView items

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The TreeView has just been updated. It now hides the folded/unfolded icon depending on the presence of child nodes, which is nice. However, I haven't discovered how to trigger the 'expand all items' feature that is supposed to have been added. Any ideas?
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1 answers
1

I'm guessing it's the highlighted property below. I haven't played with it yet though

tree widget

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