Notifications\RatingPrompt.cs(137,21): warning VSTHRD010: Accessing "Community.VisualStudio.Toolkit.InfoBar.TryGetWpfElement" should only be done on the main thread. Await JoinableTaskFactory.SwitchToMainThreadAsync() first.
Notifications\RatingPrompt.cs(148,21): warning VSTHRD010: Accessing "Community.VisualStudio.Toolkit.InfoBar.Close" should only be done on the main thread. Await JoinableTaskFactory.SwitchToMainThreadAsync() first.
Windows\WindowFrame.cs(236,20): warning VSTHRD010: Accessing "IVsWindowFrame" should only be done on the main thread. Await JoinableTaskFactory.SwitchToMainThreadAsync() first.
MEF\TokenOutliningTaggerBase.cs(60,40): warning CS8602: Dereference of a possibly null reference.
I noticed a few compiler warnings.