exclude suggestions from other contexts

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

Index: pkg/analysis_server/lib/src/services/completion/dart_completion_cache.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart_completion_cache.dart b/pkg/analysis_server/lib/src/services/completion/dart_completion_cache.dart
index 8a8500c1644e76d85969f2d07b9e729de9745563..a9872ec51604c2b8463f22bb79eafd6b2c3120ba 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart_completion_cache.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart_completion_cache.dart
@@ -253,7 +253,8 @@ class DartCompletionCache extends CompletionCache {
     matches.forEach((SearchMatch match) {
       if (match.kind == MatchKind.DECLARATION) {
         Element element = match.element;
-        if (element.isPublic &&
+        if (element.context == context &&
+            element.isPublic &&
             !excludedLibs.contains(element.library) &&
             !_importedCompletions.contains(element.displayName)) {
           _addSuggestion(element, CompletionRelevance.LOW);