Adds the ability to split a namespace declaration at a single type within the same file. This work will be used for move type to namespace as a step for splitting the namespace before moving to a new namespace declaration. May be available as a single refactor as well, but currently is not provided as such.

Fixes #30987

Update async completion and quick info to share BuildClassifiedTextElements

Update Microsoft.VisualStudio.Threading

* Don't warn about #nullable in disabled code:
 - Check if in an active code region before warning about #nullable  or #pragma directives in lower lang versions
 - Add tests

Captures Invalid Dimensions from an array variable declaration and adds it to IVariableOperation

Add max path check at beginning of build

[master] Update dependencies from dotnet/arcade

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19171.1

Wait for async completion in integration tests

See dotnet/roslyn#34331

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19170.2

Fix exception message for GetRequiredService

Move Spanish runs to new queue

* Add extra nullable test for params:
 - Call out the difference in behavior between normal / expanded form invocation for nullable params parameters

It' s already an error to fail to initialize a field of a struct, so
this warning is just a duplication of a more serious error condition

Fixes #30022

Update comment to to track status

Enable suggestions for types in reference assemblies and NuGet packages by default

Fix inline description for async completion

Use a keyboard shortcut instead of editor command

Update integration tests following the SDK 3.0 change

Include build number in integration test artifacts

Merge dev16.0 to master

It's not clear that reporting warnings for unitialized non-null fields
on the field location is better in all cases (instead of the ctor) but
it seems a Pareto improvement for default constructors, specifically.

Fixes #32444

Merge dev16.0 to master

In the command line compilation we try to discover when to stop the
compilation stages based on if an error is produced. If the error was
produced by /warnaserror, then suppressed, this should not be considered
a compilation-halting error.

Fixes #34101

Comment out parameters in the official build pipeline

Fix saving naming styles options page

Merge pull request #34195 from jasonmalinowski/fix-race-in-getopendocumentincurrentcontextwithchanges

Fix race in GetOpenDocumentInCurrentContextWithChanges

use cleaner syntax for C# Generated.cs files

See dotnet/roslyn#34264