refine when suggestions are limited to types

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

Index: pkg/analysis_server/lib/src/services/completion/imported_computer.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/imported_computer.dart b/pkg/analysis_server/lib/src/services/completion/imported_computer.dart
index 5b0d947e20b52a561e591de59c4d438abd18dbd0..8bc96086bf9775edee22948d667eb2360befbc2d 100644
--- a/pkg/analysis_server/lib/src/services/completion/imported_computer.dart
+++ b/pkg/analysis_server/lib/src/services/completion/imported_computer.dart
@@ -196,7 +196,20 @@ class _ImportedAstVisitor extends
 
   @override
   _ImportedSuggestionBuilder visitTypeName(TypeName node) {
-    return new _ImportedSuggestionBuilder(request, typesOnly: true);
+    bool typesOnly = false;
+    // If suggesting completions within a TypeName node
+    // then limit suggestions to only types in specific situations
+    AstNode p = node.parent;
+    if (p is IsExpression || p is ConstructorName || p is AsExpression) {
+      typesOnly = true;
+    } else if (p is VariableDeclarationList) {
+      // TODO (danrubel) When entering 1st of 2 identifiers on assignment LHS
+      // the user may be either (1) entering a type for the assignment
+      // or (2) starting a new statement.
+      // Consider suggesting only types
+      // if only spaces separates the 1st and 2nd identifiers.
+    }
+    return new _ImportedSuggestionBuilder(request, typesOnly: typesOnly);
   }
 
   @override