ensure correct expression is checked during read before write variable check (IDEA-135937)

java/java-psi-impl/src/com/intellij/psi/controlFlow/ControlFlowUtil.java

@@ -852,6 +852,7 @@ public class ControlFlowUtil {
 
   private static PsiReferenceExpression findReferenceTo(PsiElement element, PsiVariable variable) {
     if (element instanceof PsiReferenceExpression
+        && !((PsiReferenceExpression)element).isQualified()
         && ((PsiReferenceExpression)element).resolve() == variable) {
       return (PsiReferenceExpression)element;
     }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/FieldInitializedUsedInLambda.java

@@ -0,0 +1,17 @@
+
+import java.util.Comparator;
+
+class Test {
+  private final int x;
+
+  public Test(int x) {
+    this.x = x;
+  }
+
+  public static final Comparator<Test> comparator = (o1, o2) -> {
+    if (o1.x == o2.x) {
+    }
+    <error descr="'Test.this' cannot be referenced from a static context">this</error>.x != o2.x;
+    return 0;
+  };
+}

java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/LambdaHighlightingTest.java

@@ -32,6 +32,7 @@ public class LambdaHighlightingTest extends LightDaemonAnalyzerTestCase {
 
   public void testStaticAccess() { doTest(); }
   public void testEffectiveFinal() { doTest(); }
+  public void testFieldInitializedUsedInLambda() {doTest();}
   public void testReassignUsedVars() { doTest(); }
   public void testLambdaContext() { doTest(); }
   public void testReturnTypeCompatibility() { doTest(); }