added error source support

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now, error list will have column (which is off by default) that shows source of each errors in a format "assembly name" or "assembly name [vsix name]"

now, error list will have column (which is off by default) that shows source of each errors in a
format "assembly name" for analyzers node. and "assembly name" [vsix name] for vsix

Fix cast simplification within ConditionalAccessExpression.

Handle ConditionalAccessExpressionSyntax expressions within speculation analyzer to ensure that semantics of the conditional access expression and the WhenNotNull part don't change on cast simplication.

Fixes #253

Merge pull request #1914 from shyamnamboodiripad/SimplifierAnnotationForImplementInterfaceThruMember

Add simplifier annotation to cast expressions generated using syntax generator.

This ensures that code fixes such as Implement Interface Through Member never generate casts that user has to simplify in a subsequent manual step.

Fixes #472

Port CA1309 (Use Ordinal StringComparison) to System.Runtime.Analyzers.

Add support for highlighting written references differently than read references.

Add Visible=false metadata to one of the instances of Errors.vb

This prevents it from being listed twice in Solution Explorer.

Fixes #1876.

The fixer for this rule delves into syntax significantly and so cannot be written with just syntaxgenerator. I've refactored the fixer implementation to share some code between the C#\VB fixer.

This prevents it from being listed twice in Solution Explorer.

Fixes #1876.

Handle ConditionalAccessExpressionSyntax expressions within speculation analyzer to ensure that semantics of the conditional access expression and the WhenNotNull part don't change on cast simplication.

Fixes #253

This ensures that code fixes such as Implement Interface Through Member never generate casts that user has to simplify in a subsequent manual step.

Fixes #472

Localization fix for DiagnosticLocalizationTests.TestDiagnosticLocalization: Use the CurrentUICulture as the default culture, not "en-US" culture.

Fixes #1006 

Adding a document describing the semantics of analyzer actions and the c...

Add simplifier annotation as part of Add Using fix

Fixes #1893

Also add simplifier annotation to using directives / imports statements generated by the code generation service.

Adding a document describing the semantics of analyzer actions and the contract between the API and implementations.

Add simplifier annotation on using directives generated via the Add Using fix so that generated directives are already simplified (in the case where using is generated inside a namespace declaration) without the user having to simplify manually in a subsequent step.

Note: I also added the annotation inthe corresponding VB fix for parity. However, this should be a no-op for VB since VB only supports file-level namespace imports.

Fixes #1893

Fix spelling mistake.  Add a 'none' kind to HighlightKind to indicate you want the default highlighting for the span.

Make DiagnosticAnalyzerExtensions.GetDiagnosticAnalyzerCategory async to avoid force computing registered analyzer actions in the IDE.

Use SymReader from debugger (that supports CDI from EnC pdbs)...

This involves a couple changes:

- Fix signature of IENCSymbolReaderProvider.GetSymbolReader
- Remove all of our "fallback" SymReader creation logic and use
  ISymUnmanagedReader3 when getting custom debug info

Clean up local scopes produced by PdbToXml and update tests accordingly

Explicitly hold on to fields that can be accessed from background thread

Fix localization test failure in TestReportingUnsupportedDiagnostic. Fixes #1392  

Localization fix for DiagnosticLocalizationTests.TestDiagnosticLocalization: Use the CultureUICulture as the default culture, not "en-US" culture.

Fixes #1006

Fixes EnC function remapping of an active statement containing await expression

Explicitly hold on to fields that can be accessed from background thread in local so that we don't run into NullReferenceException / ArgumentNullException when these end up getting cleared as part of Dispose()

Make DiagnosticAnalyzerExtensions.GetDiagnosticAnalyzerCategory async to avoid force computing registered analyzer actions in the IDE.

Honor requested categories and spans specified by light bulb

The previous code for PDB emit was erroneously assuming that extern
alias declarataions and usings/imports for those declarations could
only occur at the top-level namespace scope.

This changes PDB emit to walk through all scopes above the use site
instead of just the top-level scope.

Fixes #1764.

Fix a crash during IL generation for an Expression Tree involving an extension Add method used within a collection initializer

1. When light bulb asks us for suggestions (i.e. in HasSuggestedActionsAsync() and GetSuggestedActions()), it also specifies the category of suggestions that it is looking for (code fixes, refactorings, anything etc.). So far, we were completely ignoring the requested categories. HasSuggestedActionsAsync() would always return true so long as we had a code fix (that is not a suppression fix) and GetSuggestedActions() would always return all types of suggestions (fixes, suppressions and refactorings) regardless of what the light bulb is asking for. This led to strange bugs where we would return refactorings even when light bulb didn't ask for them. In other cases, HasSuggestedActionsAsync() and GetSuggestedActions() would disagree for the same requested categories. This change makes things consistent so that we always honor the suggestion categories that the light bulb is requesting.

2. When computing refactorings we were completely ignoring the span specified by light bulb and only considering selection specified by user. This led to incorrect behavior in some cases - for example, on mouse hover over a squiggle, we would return the code fixes corresponding to the squiggle along with refactorings for completely unrelated portions of the code that the user may have previously selected.

Fixes #1030, #1595, #1631

Fixed parsing logic for rsp file arguments to implement speced behavior.

make persistent service not to support project k for now.

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also change to use cached IVsHierarchy only for error list filtering due to issue with caching it on shared projects