respect precedence for div as production argument (IDEA-187205)

java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/ReplaceExpressionUtil.java

@@ -53,6 +53,11 @@ public class ReplaceExpressionUtil {
       if (priority < parentPriority) return true;
       PsiElement element = SourceTreeToPsiMap.treeElementToPsi(oldParent);
       IElementType opType = ((PsiPolyadicExpression)element).getOperationTokenType();
+      IElementType newI = newExpr.getElementType();
+      if (newI == JavaElementType.BINARY_EXPRESSION || newI == JavaElementType.POLYADIC_EXPRESSION) {
+        IElementType newType = ((PsiPolyadicExpression)newExpr).getOperationTokenType();
+        if (newType == JavaTokenType.DIV) return true;
+      }
       return ((CompositeElement)oldParent).getChildRole(oldExpr) != ChildRole.LOPERAND &&
              opType != JavaTokenType.PLUS &&
              opType != JavaTokenType.ASTERISK &&

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/redundantCast/afterPrecedence.java

@@ -0,0 +1,8 @@
+// "Remove redundant cast(s)" "true"
+class Test {
+  {
+    int i = 1;
+    int j = 2;
+    System.out.println(j * (i / j));
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/redundantCast/beforePrecedence.java

@@ -0,0 +1,8 @@
+// "Remove redundant cast(s)" "true"
+class Test {
+  {
+    int i = 1;
+    int j = 2;
+    System.out.println(j * (i<caret>nt)(i / j));
+  }
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/daemon/quickFix/RemoveRedundantCastTest.java

@@ -0,0 +1,21 @@
+// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+
+package com.intellij.java.codeInsight.daemon.quickFix;
+
+import com.intellij.codeInsight.daemon.quickFix.LightQuickFixParameterizedTestCase;
+import com.intellij.codeInspection.redundantCast.RedundantCastInspection;
+
+public class RemoveRedundantCastTest extends LightQuickFixParameterizedTestCase {
+  @Override
+  public void setUp() throws Exception {
+    super.setUp();
+    enableInspectionTool(new RedundantCastInspection());
+  }
+
+  public void test() { doAllTests(); }
+
+  @Override
+  protected String getBasePath() {
+    return "/codeInsight/daemonCodeAnalyzer/quickFix/redundantCast";
+  }
+}