[java-inspections] IJ-CR-179807 redundant cast: simplify code

Related to IDEA-381105.

GitOrigin-RevId: b06c79e9407a54b4a79e68d49156b3780470cef5

java/java-analysis-impl/src/com/intellij/psi/util/RedundantCastUtil.java

@@ -322,11 +322,9 @@ public final class RedundantCastUtil {
 
           JavaResolveResult newResult = newExpression.advancedResolve(false);
           if (!newResult.isValidResult() || !oldMember.equals(newResult.getElement())) return false;
-          if (!Objects.equals(newExpression.getType(), refExpression.getType())) {
-            PsiType expected = ExpectedTypeUtils.findExpectedType(refExpression, false);
-            PsiType actual = newExpression.getType();
-            if (expected == null || actual == null || !TypeConversionUtil.isAssignable(expected, actual)) return false;
-          }
+          PsiType expected = ExpectedTypeUtils.findExpectedType(refExpression, false);
+          PsiType actual = newExpression.getType();
+          if (expected != null && (actual == null || !TypeConversionUtil.isAssignable(expected, actual))) return false;
           if (parent instanceof PsiReferenceExpression parentRef && !newResult.getSubstitutor().equals(resolveResult.getSubstitutor())) {
             return isCastInReferenceQualifierRedundant(parentRef);
           }

java/java-tests/testSrc/com/intellij/java/codeInspection/RedundantCastInspectionLambdaTest.java

@@ -59,8 +59,8 @@ public class RedundantCastInspectionLambdaTest extends LightDaemonAnalyzerTestCa
   public void testExplicitNullabilityAnnotation() { doTest(); }
 
   @TestFor(issues = "IDEA-381105")
-  public void testRegression() { doTest(); }
+  public void testLambdaParameterFieldAccess() { doTest(); }
 
   @TestFor(issues = "IDEA-381105")
-  public void testRegressionSimple() { doTest(); }
+  public void testLambdaParameterFieldAccessSimple() { doTest(); }
 }