RuleSet doesn't display newly added analyzers

[KathleenDollard]

Observed:

• I added the Microsoft.CodeAnalysis.CSharp.FxCopAnalyzers to a console application via NuGet
• I opened and made changes to the ruleset
• I may have made some changes in the Project Properties Code Analysis tab, but at this point the active ruleset is the project ruleset (the one with the name matching the project
• I added the CodeCracker analyzers via NuGet
• I opened the ruleset and the CodeCracker rules do not appear
• I collapsed, expanded, sorted, the CC rules did not appear
• I closed the ruleset and reopened it, the CC rules appeared

Expected:

• I do not expect to have to close and reopen the ruleset to get the new analyzers, or at the least to have in-flow guidance that this is necessary.

[srivatsn]

Automatically refreshing the ruleset might be quite hard given the current code. However, it might be feasible to put up a notification saying something's changed.

[KathleenDollard]

In my view, that would be adequate.

A Refresh button would be nice.

I knew I had added the analyzer, I just thought sorting or grouping might fix it, so I tried a number of things before closing and reopening.

[tmeschter]

There are basically two options here:

1. Add a refresh button to the rule set editor toolbar to refresh the document. This would reload the file, and as a side effect re-query IVisualStudioDiagnosticAnalyzerService.GetAllDiagnosticDescriptors and pick up the newly-added analyzers.
2. Add an event to IVisualStudioDiagnosticAnalyzerService that fires when analyzers are added to the project. This could cause the rule set editor to show a notification, or reload the document automatically.