Show Analyzers that only contain source generators

We have logic where we try to hide assemblies that were passed with the
/analyzer flag, that were really dependencies of other analyzers. This
was incorrectly firing on an assembly that only contains source
generators.

src/VisualStudio/Core/Impl/SolutionExplorer/AnalyzerItem/AnalyzerItemSource.cs

@@ -217,10 +217,12 @@ private ImmutableArray<AnalyzerReference> GetFilteredAnalyzers(IEnumerable<Analy
                 // Analyzer dependency:
                 // 1. Must be an Analyzer file reference (we don't understand other analyzer dependencies).
                 // 2. Mush have no diagnostic analyzers.
-                // 3. Must have non-null full path.
-                // 4. Must not have any assembly or analyzer load failures.
+                // 3. Must have no source generators.
+                // 4. Must have non-null full path.
+                // 5. Must not have any assembly or analyzer load failures.
                 if (analyzerReference is AnalyzerFileReference &&
                     analyzerReference.GetAnalyzers(project.Language).IsDefaultOrEmpty &&
+                    analyzerReference.GetGenerators().IsDefaultOrEmpty &&
                     analyzerReference.FullPath != null &&
                     !analyzersWithLoadErrors.Contains(analyzerReference.FullPath))
                 {