When formatting on Return FormatCommandHandler passes CancellationToken.None: https://github.com/dotnet/roslyn/blob/d4dab355b96955aca5b4b0ebf6282575fad78ba8/src/EditorFeatures/Core/Implementation/Formatting/FormatCommandHandler.ReturnKey.cs#L18 It should either explicitly disable cancellation or use cancellation token passed via CommandExecutionContext (in the new commanding).
When formatting on Return FormatCommandHandler passes CancellationToken.None:
roslyn/src/EditorFeatures/Core/Implementation/Formatting/FormatCommandHandler.ReturnKey.cs
Line 18 in d4dab35
It should either explicitly disable cancellation or use cancellation token passed via CommandExecutionContext (in the new commanding).