Introduce a more flexible service to allow languages to plug into common comment/uncomment behavior

Use Capacity instead of Count to identify large ArrayBuilder instances

changed OOP to use JsonRpc's CancellationToken support

Merge master to dev15.6

Add extension to avoid costly computation.

optimized dictionary usage

Preserve existing using sort order even if it doesn't match user preference
Fixes #19796

moved cancellation to each InvokeAsync and use cancellation support provided by JsonRpc rather than cutting connections

Move the repo to newer version of FxCop and Roslyn analyzers (2.3.0-b…

Add InternalsVisibleTo from EditorFeatures to MonoDevelop.

Order 'Make Synchronous' after 'Add Import'

Skip SourcePlusMetadataTests.InterfaceName test

made remotabledata channel to be shared by all connections

SyntaxGenerator: add support for generating tuples
Fixes #19586

Capture exception info for integration test failures

Will capture the exception stack trace in addition to the screen shot
when a first chance exception occurs running our integration tests.

Support adding PackageReferences to CPS projects

Introduce a more flexible service to allow languages to plug into common comment/uncomment behavior.