Now opens editor and viewer

[Yahiewi]

Made the urdf view open with the editor when:
-Creating a new urdf file.
-Opening an existing urdf file (by double-clicking on one from the file browser for example). Also improved the readability of the function that handles this by making it asynchronous.

[github-actions]

👈 Launch a Binder on branch Yahiewi/jupyterlab-urdf/editor-double-click

[IsabelParedes]

Resolves #64

[IsabelParedes]

Looking good! Let's make this better and open them in a split view, the editor on the left and the viewer on the right side. You can pass a options argument. For reference:

• options : https://github.com/jupyterlab/jupyterlab/blob/main/packages/docregistry/src/registry.ts#L1114
• insert mode : https://github.com/jupyterlab/jupyterlab/blob/0c9922d3f59f5f74b758030836753c069201ca77/packages/docregistry/src/registry.ts#L1114

[Yahiewi]

I added the split panel feature using the "options" mode "split-left" when creating the widgets and the mode "tab-after" when creating new widgets after the split has already been made.
Also added a splitDone flag to track whether a split has been made which uses the local storage of the user's browser to persist the layout through refreshes.
If the user doesn't wish to use this feature, they can always right click on the file and select "Open With" to open with either the editor or the viewer.

[IsabelParedes]

Almost there!

The splitting seems to be working well. There is only one case (scenario 1) where it does not behave as expected.

Scenario 1

• User opens a file and closes the Editor tab
• User opens a second URDF file
• Issue: the split does not happen anymore and all the tabs open together

Scenario 2

• User opens a file and closes the Viewer tab
• User opens a second URDF file
• No issues: editor and viewer are split as expected

[Yahiewi]

Made the split panel feature work in both scenarios by adding a few more functions to check for special cases and try to improve the tracking of the tabs (which still isn't perfect). A major shortcoming of this version is that sometimes (after certain scenarios like opening multiple tabs and keeping only the editors for some open and the viewers for others open) on refresh you get a third split panel.
I still couldn't find a way to make Jupyter properly track the tab groups even if I explicitly declared them.
In my opinion, I think the previous version, even though it doesn't work perfectly in the scenarios you suggested is still more stable and in my tests never produced the third split panel issue.