Remove unnecessary casts.

Silence "No source files" build warning

CSharpAnalyzers.Vsix.vbproj was pulling CSharp targets and csc.exe, so their supressed warnings were not being respected.
Suppressed this warning in CSharpAnalyzers.Vsix.csproj.

 Asynchronously produce the SpellChecker used for fuzzy matching.

Remove EventListener crash workaround

We've turned off AppDomain isolation in https://github.com/dotnet/roslyn/pull/8672 and https://github.com/dotnet/roslyn/pull/8534.

Merge stabilization into master

Use common output directory for Samples.

[Ask Mode] Fix IOperation crash caused by passing null for ConstantValue when creating Lite…

Search projects in parallel.  Cancel any parallel work once enough results are found.

Ask Mode request: Prevent DeriveArgument from throwing ArrayIndexOutOfRangeException when presented with semantically malformed bound trees.

Prevent DeriveArgument methods from trying to access parameter symbols that don't exist.

Disable DocCommentTest Include_Cycle_WRN_XMLDocInvalidXMLFragment

This time it is caused by BontrolVariable bounf to BoundBadExpression.
Also improved the robustness in the Condition property.

EnC: Fix handling ByRef parameters in anonymous delegates

Fix reset interactive build cancellation

Do not offer to create p2p references if the project system will not allow those references.

If we see a spike in this data we can use that to help realize that
we probably have some sort of bug/mismatch in our code to serialize/deserialize.

Prevent DeriveArgument from throwing ArrayIndexOutOfRangeException when presented with semantically malformed bound trees.

Use common output directory for Samples.
Fixes #8638

Fix an issue in the test caching layer

Update doc comment tests that contain XML comments with paths

Merge stabilization into master

The test caching layer had two bugs around re-hydrating the test resutls from cache:

- Made a bad assumption about the name of the file.
- Assumed tests were always rehydrated into the original directory.

closes #8860

Cancel the signature help if the user navigates before it has been presented