Forbid safe delete action if target element is a property setter parameter

idea/src/org/jetbrains/jet/plugin/refactoring/safeDelete/KotlinSafeDeleteProcessor.java

@@ -59,12 +59,15 @@ import java.util.*;
 public class KotlinSafeDeleteProcessor extends JavaSafeDeleteProcessor {
     public static boolean canDeleteElement(@NotNull PsiElement element) {
         if (PsiUtilPackage.isObjectLiteral(element)) return false;
+        if (element instanceof JetParameter) {
+            JetDeclaration declaration = PsiTreeUtil.getParentOfType(element, JetDeclaration.class);
+            return declaration != null && !(declaration instanceof JetPropertyAccessor && ((JetPropertyAccessor) declaration).isSetter());
+        }
         return element instanceof JetClassOrObject
                || element instanceof JetNamedFunction
                || element instanceof PsiMethod
                || element instanceof JetProperty
-               || element instanceof JetTypeParameter
-               || element instanceof JetParameter;
+               || element instanceof JetTypeParameter;
     }
 
     @Override

idea/testData/safeDelete/deleteValueParameter/kotlinValueParameter/setter.kt

@@ -0,0 +1,13 @@
+class A {
+    var foo: String
+        get() = "foo"
+        set(<caret>value: String) {
+            println()
+        }
+}
+
+class B {
+    fun bar(a: A) {
+        a.foo = "bar"
+    }
+}

idea/testData/safeDelete/deleteValueParameter/kotlinValueParameter/setter.kt.after

@@ -0,0 +1,13 @@
+class A {
+    var foo: String
+        get() = "foo"
+        set(value: String) {
+            println()
+        }
+}
+
+class B {
+    fun bar(a: A) {
+        a.foo = "bar"
+    }
+}

idea/tests/org/jetbrains/jet/safeDelete/JetSafeDeleteTestGenerated.java

@@ -823,6 +823,11 @@ public class JetSafeDeleteTestGenerated extends AbstractJetSafeDeleteTest {
             doValueParameterTest("idea/testData/safeDelete/deleteValueParameter/kotlinValueParameter/safeUsagesExt2.kt");
         }
         
+        @TestMetadata("setter.kt")
+        public void testSetter() throws Exception {
+            doValueParameterTest("idea/testData/safeDelete/deleteValueParameter/kotlinValueParameter/setter.kt");
+        }
+        
     }
     
     @TestMetadata("idea/testData/safeDelete/deleteValueParameter/kotlinValueParameterWithJava")