Unified progress bar code

extras/rhubarb-for-spine/src/main/kotlin/com/rhubarb_lip_sync/rhubarb_for_spine/MainView.kt

@@ -133,24 +133,23 @@ class MainView : View() {
 										AudioFileStatus.NotAnimated -> Text("Not animated").apply {
 											fill = Color.GRAY
 										}
-										AudioFileStatus.Pending -> ProgressBar().apply {
-											progress = -1.0 // Indeterminate
-											maxWidth = Double.MAX_VALUE
-										}
+										AudioFileStatus.Pending,
 										AudioFileStatus.Animating -> HBox().apply {
-											val progress = state.progress ?: 0.0
-											val bar = progressbar(progress) {
+											val progress: Double? = state.progress
+											val indeterminate = -1.0
+											val bar = progressbar(progress ?: indeterminate) {
 												maxWidth = Double.MAX_VALUE
 											}
 											HBox.setHgrow(bar, Priority.ALWAYS)
-											val progressString = "${(progress * 100).toInt()}%"
 											hbox {
 												minWidth = 30.0
-												text(progressString) {
+												if (progress != null) {
+													text("${(progress * 100).toInt()}%") {
 														alignment = Pos.BASELINE_RIGHT
 													}
 												}
 											}
+										}
 										AudioFileStatus.Canceling -> Text("Canceling")
 										AudioFileStatus.Done -> Text("Done").apply {
 											font = Font.font(font.family, FontWeight.BOLD, font.size)