Bug: collapse in tree produces error
Bugs
Description
Just leave a short summary what the bug is about and in which context you noticed it. Feel free to delete sections that doesn't suit the case you're dealing with.
I expected the following to happen
Collapse tree item without error
On the contrary, I observed
an error
How to reproduce the bug
Steps:
- expand tree item with arrow
- collapse tree item with arrow
Edited by Paul Pestov