JS backend: ignore reference to this when generate sourcemap

js/js.translator/src/org/jetbrains/js/compiler/JsSourceGenerationVisitor.java

@@ -61,7 +61,7 @@ public class JsSourceGenerationVisitor extends JsToStringGenerationVisitor imple
 
     @Override
     public void accept(JsNode node) {
-        if (!(node instanceof JsNameRef)) {
+        if (!(node instanceof JsNameRef) && !(node instanceof JsLiteral.JsThisRef)) {
             mapSource(node);
         }
         super.accept(node);

js/js.translator/testFiles/sourcemap/cases/methodCallInMethod.kt

@@ -0,0 +1,16 @@
+package foo
+
+//KT-4054
+
+class A() {
+    fun f0() {}
+
+    fun f1() {
+        f0()
+        this.f0()
+    }
+}
+
+fun box(): String {
+    return "OK"
+}