More space for Favorites list

[joel23888]

I would like to be able to have more space for the Favorites list. When working on a smaller screen, I can only add five items before scroll bars appear which makes it less efficient to use the Favorites list.

One possible solution from a user perspective may be to allow the user to change the split between the Favorites list and the File Browser. Another possible solution might involve having a separate Favorites button in the side bar.

Extension: 3.1.0
JupyterLab: 3.4.2
OS: Linux RedHat 7

[fcollonval]

Thanks for the suggestion @joel23888

Note: it will be nice to push an upstream PR to core JupyterLab to use an AccordionPanel for the FileBrowser

[ianhinder]

Related to this, it would also be good to be able to reduce the amount of space taken up by the favorites, perhaps even being able to collapse it completely when it's not needed.