NJ2K: fix implicit type cast in binary expressions

#KT-37298 fixed

nj2k/src/org/jetbrains/kotlin/nj2k/conversions/ImplicitCastsConversion.kt

@@ -141,7 +141,7 @@ class ImplicitCastsConversion(context: NewJ2kConverterContext) : RecursiveApplic
         val initialTypeName = expressionTypeAsPrimitive.jvmPrimitiveType.javaKeywordName.capitalize()
         val conversionFunctionName = "to${toTypeAsPrimitive.jvmPrimitiveType.javaKeywordName.capitalize()}"
         return JKQualifiedExpression(
-            copyTreeAndDetach(),
+            copyTreeAndDetach().parenthesizeIfBinaryExpression(),
             JKCallExpressionImpl(
                 symbolProvider.provideMethodSymbol("kotlin.$initialTypeName.$conversionFunctionName"),
                 JKArgumentList()

nj2k/testData/newJ2k/implicitCasts/arithmeticInFunctionCall.java

@@ -0,0 +1,11 @@
+class A {
+    void acceptDouble(double d) {}
+    void acceptDoubleBoxed(Double d) {}
+
+    public void conversion() {
+        int a = 10;
+        float b = 0.7f;
+        acceptDouble(a * b)
+        acceptDoubleBoxed(a * b)
+    }
+}

nj2k/testData/newJ2k/implicitCasts/arithmeticInFunctionCall.kt

@@ -0,0 +1,10 @@
+internal class A {
+    fun acceptDouble(d: Double) {}
+    fun acceptDoubleBoxed(d: Double?) {}
+    fun conversion() {
+        val a = 10
+        val b = 0.7f
+        acceptDouble((a * b).toDouble())
+        acceptDoubleBoxed((a * b).toDouble())
+    }
+}

nj2k/tests/org/jetbrains/kotlin/nj2k/NewJavaToKotlinConverterSingleFileTestGenerated.java

@@ -2727,6 +2727,24 @@ public class NewJavaToKotlinConverterSingleFileTestGenerated extends AbstractNew
         }
     }
 
+    @TestMetadata("nj2k/testData/newJ2k/implicitCasts")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class ImplicitCasts extends AbstractNewJavaToKotlinConverterSingleFileTest {
+        private void runTest(String testDataFilePath) throws Exception {
+            KotlinTestUtils.runTest(this::doTest, this, testDataFilePath);
+        }
+
+        public void testAllFilesPresentInImplicitCasts() throws Exception {
+            KotlinTestUtils.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("nj2k/testData/newJ2k/implicitCasts"), Pattern.compile("^([^\\.]+)\\.java$"), null, true);
+        }
+
+        @TestMetadata("arithmeticInFunctionCall.java")
+        public void testArithmeticInFunctionCall() throws Exception {
+            runTest("nj2k/testData/newJ2k/implicitCasts/arithmeticInFunctionCall.java");
+        }
+    }
+
     @TestMetadata("nj2k/testData/newJ2k/importStatement")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)