Cherry pick in 16.9 - Fix signature help in CEs and use better heuristics (#10835)#10847

Merged

vzarytovskii merged 1 commit intodotnet:release/dev16.9from cartermp:cp_sighelpfix

Jan 7, 2021

+217-41

Commits on Jan 7, 2021

Fix signature help in CEs and use better heuristics (dotnet#10835 )
cartermp
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