ipytree_ipyleaflet example: node names not displaying

[tylere]

In the ipytree_ipyleaflet example, the node names for the cities do not appear until after you click on a different city name.

To reproduce:

1. Start up the example using binder
2. Cell -> Run All

Result:

• The node names for the cities are not displayed. See screenshot.

• After clicking midway between the "Markers" and "Layers" folders of the tree widget, the selected node remains invisible, while the other nodes become visible:

[martinRenou]

Thanks! I'll look into it. It might be a CSS issue for the selection.