Error is reported when qualified this is used to initialize a final variable

Fixes IDEA-191686 Bad code is green (cannot assign a value to final variable)

java/java-analysis-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightControlFlowUtil.java

@@ -652,7 +652,8 @@ public class HighlightControlFlowUtil {
 
     if (!containingFile.getManager().areElementsEquivalent(enclosingCtrOrInitializer.getContainingClass(), field.getContainingClass())) return false;
     PsiExpression qualifierExpression = reference.getQualifierExpression();
-    return qualifierExpression == null || qualifierExpression instanceof PsiThisExpression;
+    return qualifierExpression == null || (qualifierExpression instanceof PsiThisExpression &&
+                                           ((PsiThisExpression)qualifierExpression).getQualifier() == null);
   }
 
 

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting/AssignToFinal.java

@@ -243,3 +243,12 @@ class AssignmentInUnreachablePolyadic {
     else if (true && (<error descr="Variable 'bbbb' might already have been assigned to">bbbb</error> = false)) ;
   }
 }
+
+class QualifiedThis {
+  final int x;
+
+  QualifiedThis() {
+    <error descr="Cannot assign a value to final variable 'x'">QualifiedThis.this.x</error> = 5;
+    <error descr="Variable 'x' might already have been assigned to">this.x</error> = 5;
+  }
+}