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I have a problem with your add-on Vaadin.
I have a grid in a window. The grid contains two parent node and each parent node contains some child node.
When all nodes are fold up and I unfold one node, I can have a bug display in treegrid like this
Nevertheless, I don't have this problem when the grid is not in a window and when I use Chrome. The problem is just with IE.
For reference, the issue about this on Github: https://github.com/vaadin/tree-grid/issues/13