JupyterLab: "Create New View for Output": CSS broken

[vogelsgesang]

Reproduction steps

1. Create a new notebook
2. Execute the code

   import ipywidgets
   ipywidgets.Label(value="Some label")
   

3. Open the context menu by rigth-clicking on the displayed widget
4. Click on "Create New View for Output"

Observed behavior

The opened "Output View" panel has a scrollbar on the right side

Expected behavior

No scrollbar, since the label fits into the output area easily

JupyterLab version 2.0.1
ipywidgets version 7.5.1
@jupyter-widgets/jupyterlab-manager version 2.0.0
Checked in Chrome and Firefox

[vogelsgesang]

Looking into the dev-tools, it seems this is caused by bad interaction between the jupyter-widgets CSS class and the CSS rule .jp-LinkedOutputView .jp-OutputArea-output:only-child

The jupyter-widgets class adds a margin of 2px on each side.
The CSS rule .jp-LinkedOutputView .jp-OutputArea-output:only-child sets the height to 100%.
This leads to an overall height of 100% + 2*2px.
Since this is larger than 100%, the scrollbar appears.

It seems this might have fixed as a lucky by-product of merging #2500.
But I am not sure how to verify/how to install ipywidgets 8.0