Ignore unknown files to search from in document highlights

[sheetalkamat]

@amcasey this fixes the issue you brought up when two files don't belong to same project during your scenario we were getting exception earlier.

[amcasey]

@sheetalkamat Thanks! Would it be helpful to have a list of the commands affected by this error?

[sheetalkamat]

DocumentHighlights, DocumentHighlights-Full and Occurrences

[amcasey]

Sorry, my question wasn't very clear. I believe there are some other commands that might be affected by related issues. In 3.5.2, we were seeing this error for:

completionEntryDetails
completionInfo
completions-full
definition
definition-full
definitionAndBoundSpan
definitionAndBoundSpan-full
documentHighlights
documentHighlights-full
encodedSemanticClassifications-full
getApplicableRefactors
getCodeFixes
getCodeFixes-full
implementation
implementation-full
organizeImports
organizeImports-full
quickinfo
quickinfo-full
references
rename
semanticDiagnosticsSync
signatureHelp
suggestionDiagnosticsSync
syntacticDiagnosticsSync
typeDefinition

[sheetalkamat]

@amcasey that seems more like something else might have gone wrong before this .. this fix was specific to repro you sent me and i had looked up if there exists anything similar throughout our code base. Other commands can go bad with bad project state or something following early exception ?

[amcasey]

@sheetalkamat Unfortunately, I don't have additional information. If I find a repro for one of the other commands, I'll let you know.