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Revert "Use immutable types in signature help (#80322)" (#80421)
Merge remote-tracking branch 'upstream/features/collection-expression-arguments' into portIDEFeatures2
Remove unnnecessary null suppressions in Roslyn.sln
Cleanup hierarchy
Add tests
Ensure LSP uses actual signature help trigger characters
Fix signature help selecting wrong overload for multiple type parameter extension methods (#84089)
reorder includeIntence conditions for perf
Sort usings
fixup