Syntax highlighting doesn't change when commenting out class inheritence part (part starting from colon[:])

[DustinCampbell]

From @aeschli on February 16, 2017 8:11

From @3rdey3 on February 15, 2017 14:42

• VSCode Version: Code 1.9.1 (f9d0c687ff2ea7aabd85fb9a43129117c0ecf519, 2017-02-09T00:26:45.394Z)
• OS Version: Windows_NT ia32 10.0.14393
• Extensions:

Extension	Author	Version
csharp	ms-vscode	1.7.0
PowerShell	ms-vscode	0.9.0
vim	vscodevim	0.5.3

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Steps to Reproduce:

1. declare a class with inheritance. i.e. public class CustomBootstrapper : DefaultNancyBootstrapper
2. try to comment out everything after : with // or /* */

Copied from original issue: microsoft/vscode#20658

Copied from original issue: dotnet/vscode-csharp#1243