Maven: Fix <args> parsing on import to the Kotlin facet

#KT-22153 Fixed

idea/idea-maven/src/org/jetbrains/kotlin/idea/maven/KotlinMavenImporter.kt

@@ -175,7 +175,6 @@ class KotlinMavenImporter : MavenImporter(KOTLIN_PLUGIN_GROUP_ID, KOTLIN_PLUGIN_
                     }
                 }
             }
-            argsElement?.getChildren("arg")?.mapNotNullTo(this) { it.text }
         }
         parseCommandLineArguments(additionalArgs, arguments)
 

idea/idea-maven/test/org/jetbrains/kotlin/idea/maven/KotlinMavenImporterTest.kt

@@ -2250,6 +2250,57 @@ class KotlinMavenImporterTest : MavenImportingTestCase() {
         TestCase.assertTrue(dependencies.any { it.name.asString() == "<test sources for module module-with-java>" })
     }
 
+    fun testNoArgDuplication() {
+        createProjectSubDirs("src/main/kotlin", "src/main/kotlin.jvm", "src/test/kotlin", "src/test/kotlin.jvm")
+
+        importProject("""
+        <groupId>test</groupId>
+        <artifactId>project</artifactId>
+        <version>1.0.0</version>
+
+        <dependencies>
+            <dependency>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-stdlib</artifactId>
+                <version>$kotlinVersion</version>
+            </dependency>
+        </dependencies>
+
+        <build>
+            <sourceDirectory>src/main/kotlin</sourceDirectory>
+
+            <plugins>
+                <plugin>
+                    <groupId>org.jetbrains.kotlin</groupId>
+                    <artifactId>kotlin-maven-plugin</artifactId>
+
+                    <executions>
+                        <execution>
+                            <id>compile</id>
+                            <phase>compile</phase>
+                            <goals>
+                                <goal>compile</goal>
+                            </goals>
+                        </execution>
+                    </executions>
+                    <configuration>
+                        <args>
+                            <arg>-Xjsr305=strict</arg>
+                        </args>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </build>
+        """)
+
+        assertModules("project")
+        assertImporterStatePresent()
+
+        with (facetSettings) {
+            Assert.assertEquals("-Xjsr305=strict", compilerSettings!!.additionalArguments)
+        }
+    }
+
     private fun assertImporterStatePresent() {
         assertNotNull("Kotlin importer component is not present", myTestFixture.module.getComponent(KotlinImporterComponent::class.java))
     }