Give user feedback when searching for a jupyter server to use and make it cancelable

[greazer]

If the user doesn't have a python interpreter selected, or the interpreter's environment doesn't have jupyter installed, we search. This search process can potentially take a long time.

We should notify that this situation is happening and that we're searching for a jupyter to use. One idea is to use the same notification style the AML extension uses, rather than a status message that people just don't see. In addition we can have a cancel button.

[DonJayamanne]

We should notify that this situation is happening and that we're searching for a jupyter to use. One idea is to use the same notification style the AML extension uses

@rchiodo @ronglums @IanMatthewHuff Please could you advice on the message that needs to be displayed.

Here's the current message and the progress displayed.

• I'm displaying the message Active interpreter does not support {0}. Searching for the best available interpreter. (where {0} will be one of the commands we check notebook, jupyter, etc.
• As part of the progress I display the name of the interpreter thats being checked.

You can see this in the blow animated Gif (added a forced delay so that the messages appear and you can see them).

Forced delays

No delays (actual speed)
Note: You'll see two messages that because I've forced the display of the messages

[rchiodo]

Looks good to me. Are you saying it's too fast?

[DonJayamanne]

Looks good to me. Are you saying it's too fast?

No, added a slower version so one could see the exact contents of the progress message.

[rchiodo]

Validated, but the UI feels weird. My expectation is that the dialog will stay open until the server starts. I'm going to enter a separate issue for that.

[DonJayamanne]

I'm going to enter a separate issue for that.

Agreed.