Kotlin Facet: Do not concat "additional argument" string as configuration gets duplicated

KT-16548 Fixed

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

@@ -158,7 +158,7 @@ class KotlinMavenImporter : MavenImporter(KOTLIN_PLUGIN_GROUP_ID, KOTLIN_PLUGIN_
                                          ?.configurationElement?.let { getCompilerArgumentsByConfigurationElement(it, configuredPlatform) }
         parseCompilerArgumentsToFacet(sharedArguments, emptyList(), kotlinFacet)
         if (executionArguments != null) {
-            parseCompilerArgumentsToFacet(executionArguments, emptyList(), kotlinFacet, true)
+            parseCompilerArgumentsToFacet(executionArguments, emptyList(), kotlinFacet)
         }
         MavenProjectImportHandler.getInstances(module.project).forEach { it(kotlinFacet, mavenProject) }
     }

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

@@ -588,7 +588,7 @@ class KotlinMavenImporterTest : MavenImportingTestCase() {
             Assert.assertEquals("enable", compilerInfo.coroutineSupport.compilerArgument)
             Assert.assertEquals("JVM 1.8", versionInfo.targetPlatformKind!!.description)
             Assert.assertEquals("1.8", compilerInfo.k2jvmCompilerArguments!!.jvmTarget)
-            Assert.assertEquals("-version -cp foobar.jar -jdk-home JDK_HOME -Xmulti-platform",
+            Assert.assertEquals("-cp foobar.jar -jdk-home JDK_HOME -Xmulti-platform",
                                 compilerInfo.compilerSettings!!.additionalArguments)
         }
     }

idea/src/org/jetbrains/kotlin/idea/facet/facetUtils.kt

@@ -156,12 +156,7 @@ private val CommonCompilerArguments.exposedFields: List<String>
         else -> commonExposedFields
     }
 
-fun parseCompilerArgumentsToFacet(
-        arguments: List<String>,
-        defaultArguments: List<String>,
-        kotlinFacet: KotlinFacet,
-        appendAdditionalArguments: Boolean = false
-) {
+fun parseCompilerArgumentsToFacet(arguments: List<String>, defaultArguments: List<String>, kotlinFacet: KotlinFacet) {
     val argumentArray = arguments.toTypedArray()
 
     with(kotlinFacet.configuration.settings) {
@@ -216,14 +211,8 @@ fun parseCompilerArgumentsToFacet(
             copyFieldsSatisfying(compilerArguments, this, ::exposeAsAdditionalArgument)
             ArgumentUtils.convertArgumentsToStringList(this).joinToString(separator = " ")
         }
-
-        val newAdditionalArguments = if (additionalArgumentsString.isNotEmpty()) additionalArgumentsString else CompilerSettings.DEFAULT_ADDITIONAL_ARGUMENTS
-        if (appendAdditionalArguments) {
-            compilerInfo.compilerSettings!!.additionalArguments += " $newAdditionalArguments"
-        }
-        else {
-            compilerInfo.compilerSettings!!.additionalArguments = newAdditionalArguments
-        }
+        compilerInfo.compilerSettings!!.additionalArguments =
+                if (additionalArgumentsString.isNotEmpty()) additionalArgumentsString else CompilerSettings.DEFAULT_ADDITIONAL_ARGUMENTS
 
         with(compilerArguments.javaClass.newInstance()) {
             copyFieldsSatisfying(this, compilerArguments, ::exposeAsAdditionalArgument)