Configuration: Ensure facet UI is initialized in apply() call

#KT-27187 Fixed

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

@@ -241,7 +241,7 @@ class KotlinFacetEditorGeneralTab(
         }
     }
 
-    fun initialize() {
+    fun initializeIfNeeded() {
         if (isInitialized) return
 
         editor.initialize()
@@ -277,7 +277,7 @@ class KotlinFacetEditorGeneralTab(
     }
 
     override fun onTabEntering() {
-        initialize()
+        initializeIfNeeded()
     }
 
     override fun isModified(): Boolean {
@@ -298,6 +298,7 @@ class KotlinFacetEditorGeneralTab(
     }
 
     override fun apply() {
+        initializeIfNeeded()
         validateOnce {
             editor.compilerConfigurable.apply()
             with(configuration.settings) {

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

@@ -39,7 +39,7 @@ class MultipleKotlinFacetEditor(
     override fun createComponent(): JComponent? {
         return KotlinFacetEditorGeneralTab.EditorComponent(project, null).apply {
             initialize()
-            editors.flatMap { it.editorTabs.filterIsInstance<KotlinFacetEditorGeneralTab>() }.forEach { it.initialize() }
+            editors.flatMap { it.editorTabs.filterIsInstance<KotlinFacetEditorGeneralTab>() }.forEach { it.initializeIfNeeded() }
             helper.bind(useProjectSettingsCheckBox, editors) { it.tabEditor.useProjectSettingsCheckBox }
             helper.bind(targetPlatformComboBox, editors) { it.tabEditor.targetPlatformComboBox }
             with(compilerConfigurable) {