+ *
+ * If @text is %NULL and #GtkProgressBar:show-text is %TRUE, the current
+ * value of #GtkProgressBar:fraction will be displayed as a percentage.
+ *
+ * If @text is non-%NULL and #GtkProgressBar:show-text is %TRUE, the text will
+ * be displayed. In this case, it will not display the progress percentage.
+ * If @text is the empty string, the progress bar will still be styled and sized
+ * suitably for containing text, as long as #GtkProgressBar:show-text is %TRUE.
+ */