filter static methods when showing instance completions

pkg/analysis_server/lib/src/services/completion/invocation_computer.dart

Index: pkg/analysis_server/lib/src/services/completion/invocation_computer.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/invocation_computer.dart b/pkg/analysis_server/lib/src/services/completion/invocation_computer.dart
index 9913a6329a4737b30c171614c30fca636cc3f19b..0dc731937dd456761142f0f7a55c95ca5505c090 100644
--- a/pkg/analysis_server/lib/src/services/completion/invocation_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/invocation_computer.dart
@@ -63,6 +63,11 @@ class _ExpressionSuggestionBuilder implements SuggestionBuilder {
     } else if (node is PropertyAccess) {
       node = (node as PropertyAccess).realTarget;
     }
+    if (node is Identifier && node.bestElement is ClassElement) {
+      node.bestElement.accept(
+          new _PrefixedIdentifierSuggestionBuilder(request));
+      return new Future.value(true);
+    }
     if (node is Expression) {
       InterfaceTypeSuggestionBuilder.suggestionsFor(request, node.bestType);
       return new Future.value(true);