invoke next handler in case if no signature help providers can be fou…

Remove System.AppContext to Roslyn.VisualStudio.InteractiveComponents

Update FX dependencies to build 24011

Merge master into future

invoke next handler in case if no signature help providers can be found (i.e. if document for the text snapshot cannot be found)

Fix DSR.PortablePdb package version

Merge stabilization into master

You should be able to navigate to items that are in generated code.

Fixes #8009

An ArrowExpressionClauseSyntax is special because it has an expression as its direct child. Because of that the binder was not correctly caching all nodes of the bound tree and instead was falling back to binding decendand nodes by themself when asked for them. This fails if in the decendant nodes there is a color color case.

With this change the binder does cache all of the ArrowExpressionClauseSyntax's children including the correctly resolved symbols for a color color situation.
Fixes #5362
Closes #8167

Filter GetRelatedDocumentIds and GetLinkedDocumentIds by language to resolve NullReferenceExceptions in Salsa ContainedDocument scenarios

Move groovy to dotnet-ci standard functions

Use the standard archive function for the dotnet-ci tools.

This was only previously necessary on Mac / Linux because of our Mono installation process.  This is no longer done now that we are on CoreClr.

VB: Always import instance fields for an Enum type in order to be able to infer underlying type of its elements.

Merge master into future

Check that constant patterns are constant

Merge future-stabilization into future

Merge remote-tracking branch 'upstream/future-stabilization' into merge-future-stabilization-into-future20160415-150211

Unify NuGet dependencies across the tree

Delete the last remaining project.lock.json

These keep coming back.

To prevent projects across the tree from having different dependencies, we unify
external package dependencies by creating empty C# projects that represent them.
We then make use of project.json package inheritance (where a project inherits
all packages dependencies from their dependencies) to unify it across the tree.

No projects outside of this tree, should be directly referencing versions of
these dependencies manually.

For this check-in I've tackled Metadata, Reflection, and DiaSymReader. Will tackle
the rest in future commits.

some code clean up and made active and project state to be merged when a file is closed