Issue 26063. Index declarations in even partically analyzed units.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index 4e5036dd4974c76e3f5e15156d4ea6c090582ac1..101348b6839ad8b34e39445cfb9720537b2da4a7 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -1471,6 +1471,16 @@ class AnalysisServer {
     onContextsChanged.listen((ContextsChangedEvent event) {
       for (AnalysisContext context in event.added) {
         context
+            .onResultChanged(RESOLVED_UNIT2)
+            .listen((ResultChangedEvent event) {
+          if (event.wasComputed) {
+            Object value = event.value;
+            if (value is CompilationUnit) {
+              index.indexDeclarations(value);
+            }
+          }
+        });
+        context
             .onResultChanged(RESOLVED_UNIT)
             .listen((ResultChangedEvent event) {
           if (event.wasInvalidated) {