ark: Quick restarts after typing can trigger an LSP error

[DavisVaughan]

In a release build of Positron (234, at the time of writing) try:

• Type something in the Console
• Immediately restart R with CMD+SHIFT+0

I often end up with this LSP error

Screen.Recording.2023-08-24.at.5.01.44.PM.mov

I can also reproduce when typing in a document and then quickly restarting (but not quite as reliably)

I would guess what happens is something like:

• We make a document / console change, diagnostics are enqueued with a delay of 1 second
• During that 1 second, we restart R, nuking something that the LSP would need to use
• The 1 second is up, so the LSP tries to run the enqueued diagnostics, but whatever it needed is no longer available

I am not sure why I can't easily reproduce in a dev build right now (maybe something was fixed today?)

[jmcphers]

I think this might have been fixed by #1144.

[DavisVaughan]

Oh yes in particular Lionel also reported this in this comment #1038 (comment)