Wizard: do not show drop down component if it has <= 1 possible values

idea/idea-new-project-wizard/src/org/jetbrains/kotlin/tools/projectWizard/wizard/ui/components/DropDownComponent.kt

@@ -19,7 +19,7 @@ class DropDownComponent<T : DisplayableSettingItem>(
     initialValues: List<T> = emptyList(),
     initiallySelectedValue: T? = null,
     labelText: String? = null,
-    private val filter: (T) -> Boolean = { true },
+    filter: (T) -> Boolean = { true },
     private val validator: SettingValidator<T> = settingValidator { ValidationResult.OK },
     private val iconProvider: (T) -> Icon? = { null },
     onValueUpdate: (T) -> Unit = {}
@@ -68,10 +68,8 @@ class DropDownComponent<T : DisplayableSettingItem>(
         }
     }
 
-    fun setValues(newValues: List<T>) {
+    val valuesCount
-        @Suppress("UNCHECKED_CAST")
+        get() = uiComponent.model.size
-        uiComponent.model = DefaultComboBoxModel(newValues.filter(filter).toTypedArray<DisplayableSettingItem>() as Array<T>)
-    }
 
     override fun updateUiValue(newValue: T) = safeUpdateUi {
         uiComponent.selectedItem = newValue

idea/idea-new-project-wizard/src/org/jetbrains/kotlin/tools/projectWizard/wizard/ui/setting/DefaultSettingComponent.kt

@@ -118,6 +118,9 @@ class DropdownSettingComponent(
         labelText = setting.title.takeIf { needLabel },
         onValueUpdate = { newValue -> value = newValue }
     ).asSubComponent()
+
+    override fun shouldBeShow(): Boolean =
+        uiComponent.valuesCount > 1
 }
 
 class BooleanSettingComponent(