Don't cause index out of range exn in completion #17227
Merged
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Description
Fixes #17226.
Checklist
Tests: I spent a while trying to get a test for this to work, but it seems like it might be rather difficult, since this pathway only seems to be called sometimes. Compare:
fsharp/src/Compiler/Service/FSharpCheckerResults.fs
Lines 1316 to 1318 in ef2307d
But here's a recording of the fix working:
dot_delegate_working.mp4
Release notes entry updated.