inspector updates

[akhmerov]

I've just discovered the inspector, and I found it super cool! I have two remarks for your consideration:

• When it is initially opened, it's completely blank and non-interactive, and it took me some time to figure out how to use it. Perhaps use the time when it's blank to show a brief hint describing what it should do.
• As far as I could tell, inspector is only updated on key press events. This may be inferior to updating it whenever user moves the cursor. Alternatively one could reuse the shortcut for firing up the inspector also for refreshing its state. Or yet another option would be to invoke/update the inspector upon consecutive pressed of shift-tab, similar to the classic notebook.

[AbdealiLoKo]

Noob question: how do I get it to work? I do that know what to do with the blank screen :|

[blink1073]

It responds to typing in a cell and shows the documentation automatically.

Type print( and it will show the docstring.

[akhmerov]

Hehe, @AbdealiJK I had exactly the same problem. That's why I suggested to make the default status not blank. I even checked developer console and updated jlab because the inspector looked like it was missing.

[giladgressel]

Just gonna chime in that I literally spent like 10 minutes searching the docs trying to understand what it did. Finally just googled and got here.
It's pretty cool. Does what shift-tab x4 does from reg notebook.

[jasongrout]

Definitely +1 to some help text when it initially opens.

[jasongrout]

Adding "good first issue" - the initial help page should be pretty straightforward to add. The inspector panel is at https://github.com/jupyterlab/jupyterlab/blob/master/packages/inspector/src/inspector.ts. Perhaps a constructor argument should take some initial help text?

[jasongrout]

Fixed by #6476 (and someone else fixed it so that it responded to cursor movements, not just keyboard movements).

[lock]

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