IDEA-162322 Completion missing for field in copy constructor

java/java-impl/src/com/intellij/codeInsight/completion/CheckInitialized.java

@@ -16,6 +16,7 @@
 package com.intellij.codeInsight.completion;
 
 import com.intellij.codeInsight.daemon.ImplicitUsageProvider;
+import com.intellij.codeInspection.dataFlow.value.DfaValueFactory;
 import com.intellij.psi.*;
 import com.intellij.psi.filters.ElementFilter;
 import com.intellij.psi.infos.CandidateInfo;
@@ -64,6 +65,10 @@ class CheckInitialized implements ElementFilter {
     }
 
     PsiElement parent = element.getParent();
+    if (parent instanceof PsiReferenceExpression && !DfaValueFactory.isEffectivelyUnqualified((PsiReferenceExpression)parent)) {
+      return Collections.emptySet();
+    }
+
     while (parent != statement) {
       PsiElement next = parent.getParent();
       if (next instanceof PsiAssignmentExpression && parent == ((PsiAssignmentExpression)next).getLExpression()) {

java/java-tests/testData/codeInsight/completion/normal/CopyConstructor.java

@@ -0,0 +1,7 @@
+class CopyConstructor {
+    private final String ad;
+
+    public CopyConstructor(CopyConstructor other) {
+        this.ad = other.a<caret>
+    }
+}

java/java-tests/testData/codeInsight/completion/normal/CopyConstructor_after.java

@@ -0,0 +1,7 @@
+class CopyConstructor {
+    private final String ad;
+
+    public CopyConstructor(CopyConstructor other) {
+        this.ad = other.ad<caret>
+    }
+}

java/java-tests/testSrc/com/intellij/codeInsight/completion/NormalCompletionTest.groovy

@@ -1728,4 +1728,6 @@ class Bar {
     myFixture.assertPreferredCompletionItems 0, "dx", "doo", "Doo", "double"
   }
 
+  void testCopyConstructor() { doTest('\n') }
+
 }