fix(a11y): treeview incorrect levels (backport to 16.x) #1385
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Backport 9c67c41 from #1383.
## PR Checklist
Please check if your PR fulfills the following requirements:
PR Type
What kind of change does this PR introduce?
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What is the current behavior?
<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
The screen reader is reading out incorrect levels in case of a recursive tree view component.
Issue Number: CDE-1697
What is the new behavior?
The screen reader will read out correct levels for the recursive tree view
Does this PR introduce a breaking change?
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