change signature: do not show conflicts about non-changed param names

java/java-tests/testData/refactoring/changeSignature/ParamNameNoConflict.java

@@ -0,0 +1,11 @@
+class D {
+    void f<caret>oo(Object o){}
+}
+
+class DImpl extends D {
+    void foo(Object o1) {
+        super.foo(o1);
+        int o = 0;
+        System.out.println(o);
+    }
+}

java/java-tests/testData/refactoring/changeSignature/ParamNameNoConflict_after.java

@@ -0,0 +1,11 @@
+class D {
+    void foo(Object o, boolean b){}
+}
+
+class DImpl extends D {
+    void foo(Object o1, boolean b) {
+        super.foo(o1, b);
+        int o = 0;
+        System.out.println(o);
+    }
+}

java/java-tests/testSrc/com/intellij/refactoring/ChangeSignatureTest.java

@@ -134,6 +134,13 @@ public class ChangeSignatureTest extends LightRefactoringTestCase {
     }, false);
   }
 
+  public void testParamNameNoConflict() throws Exception {
+    doTest(null, new ParameterInfoImpl[]{
+      new ParameterInfoImpl(0),
+      new ParameterInfoImpl(-1, "b", PsiType.BOOLEAN)
+    }, false);
+  }
+
   public void testParamJavadoc() throws Exception {
     doTest(null, new ParameterInfoImpl[] {
       new ParameterInfoImpl(1, "z", PsiType.INT),