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Reduce allocations during source text diffing (#82462)
Move files
Reapply "Move to .NET 10 Preview 5 (#78906)"
Update editor features to use file scoped namespaces
Remove obsolete diff overview margin workaround (#84546)
Sort usings
Make sealed
Reapply "Update methods to be `async`." (#81808)
Move SpecializedCollections to Microsoft.CodeAnalysis.Collections namespace (#78466)