[js] Fix object property with method type

Fix #3948

pmd-javascript/src/main/java/net/sourceforge/pmd/lang/ecmascript/ast/AbstractInfixEcmascriptNode.java

@@ -27,7 +27,7 @@ public class AbstractInfixEcmascriptNode<T extends InfixExpression> extends Abst
         if (setImage) {
             if (infixExpression.getOperator() == Token.ASSIGN_BITXOR) {
                 super.setImage("^=");
-            } else {
+            } else if (infixExpression.getOperator() != Token.METHOD) {
                 super.setImage(AstRoot.operatorToString(infixExpression.getOperator()));
             }
         }

pmd-javascript/src/test/java/net/sourceforge/pmd/lang/ecmascript/ast/JsTreeDumpTest.java

@@ -40,4 +40,10 @@ public class JsTreeDumpTest extends BaseTreeDumpTest {
     public void templateStrings() {
         doTest("templateStrings");
     }
+
+    @Test
+    public void issue3948() {
+        // https://github.com/pmd/pmd/issues/3948
+        doTest("issue3948");
+    }
 }

pmd-javascript/src/test/resources/net/sourceforge/pmd/lang/ecmascript/ast/testdata/issue3948.js

@@ -0,0 +1,3 @@
+x = {
+    init() { }
+};

pmd-javascript/src/test/resources/net/sourceforge/pmd/lang/ecmascript/ast/testdata/issue3948.txt

@@ -0,0 +1,9 @@
++- AstRoot
+   +- ExpressionStatement
+      +- Assignment
+         +- Name
+         +- ObjectLiteral
+            +- ObjectProperty
+               +- Name
+               +- FunctionNode
+                  +- Block