Raise explicit NonExistingDocumentError for unseen untitled files #2334
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Motivation
I'm not exactly sure what order of operations is required to trigger this problem, but based on our telemetry it seems to be possible to receive a request for an unsaved file before we received a
didOpen
notification for it.Since the file is unsaved, we cannot try to read it from disk and there's no path associated to it.
Implementation
Started checking if
path
exists. If we never saw the document before (it's not in the store) and there's nopath
, then we have no hope of figuring out what the document contains. We can only raise.Automated Tests
Added a test reproducing the issue.