Prompt with @input behaves differently when @input has no spaces in the string

[marckruzik]

Describe the bug

This example from the doc is working:

#!set --name url --value @input:"Please enter a URL"

Which gives a prompt Please enter a URL.

But if there is no space in the input, the prompt changes.

#!set --name url --value @input:"Please-enter-a-URL"

Which gives a prompt Please enter a value for field "Please-enter-a-URL".. But it should give the prompt Please-enter-a-URL.

Same goes with a one word input such as "Age".

#!set --name url --value @input:"Age"

I think the intended behavior of @input is to specify the prompt, rather than having a wording about a field. So in all cases, the prompt should be the content specified in @input.

Notes

Maybe there is a confusion with @input:input-please (notice the absence of double quotes), as seen in VariableSharingTests.SetMagicCommand.cs:

#!set --name newVar3 --value @input:input-please

This is an undocumented use of @input. The behavior seems to be the same with @input:input-please (without double quotes) and @input:"input-please" (with double quotes): it asks for a field instead of using the text in place of the prompt.

Please complete the following:

Which version of .NET Interactive are you using? (In a notebook, run the #!about magic command. ):

Version: 1.0.456201+e5dc02dbdc933d895d722e69bfa98d580dcda8d9

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[jonsequitur]

The current logic is that if there's no other option in the magic command to indicate a field name (e.g. the --name option for the #!set command), and the prompt is usable as a field name (e.g. has no spaces), then the field name is inferred from the prompt.

I'm fixing some of the quote behavior inconsistencies as part of the PR for #3323.