JS: fix wrapping keys for native indexers

jso/impl/src/main/java/org/teavm/jso/impl/JSClassProcessor.java

@@ -631,7 +631,7 @@ class JSClassProcessor {
         }
         if (isProperSetIndexer(method.getDescriptor())) {
             var index = invoke.getArguments().get(0);
-            marshaller.wrapArgument(callLocation, index, method.parameterType(0), types.typeOf(index), false);
+            index = marshaller.wrapArgument(callLocation, index, method.parameterType(0), types.typeOf(index), false);
             var value = invoke.getArguments().get(1);
             value = marshaller.wrapArgument(callLocation, value, method.parameterType(1),
                     types.typeOf(value), false);

tests/src/test/java/org/teavm/jso/test/ImportClassTest.java

@@ -0,0 +1,57 @@
+/*
+ *  Copyright 2023 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.jso.test;
+
+import static org.junit.Assert.assertEquals;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.teavm.jso.JSBody;
+import org.teavm.jso.JSIndexer;
+import org.teavm.jso.JSObject;
+import org.teavm.junit.EachTestCompiledSeparately;
+import org.teavm.junit.OnlyPlatform;
+import org.teavm.junit.SkipJVM;
+import org.teavm.junit.TeaVMTestRunner;
+import org.teavm.junit.TestPlatform;
+
+@RunWith(TeaVMTestRunner.class)
+@SkipJVM
+@OnlyPlatform(TestPlatform.JAVASCRIPT)
+@EachTestCompiledSeparately
+public class ImportClassTest {
+    @Test
+    public void indexer() {
+        var o = create();
+        o.set("foo", 23);
+        set(o, "bar", 42);
+        assertEquals(23, o.get("foo"));
+        assertEquals(42, o.get("bar"));
+    }
+
+    @JSBody(script = "return {};")
+    private static native O create();
+
+    @JSBody(params = { "o", "key", "value" }, script = "o[key] = value;")
+    private static native void set(O o, String key, int value);
+
+    interface O extends JSObject {
+        @JSIndexer
+        int get(String key);
+
+        @JSIndexer
+        void set(String key, int value);
+    }
+}