Causes the given @text to appear next to the progress bar.
If @text is %NULL and [property@Gtk.ProgressBar:show-text] is %TRUE,
the current value of [property@Gtk.ProgressBar:fraction] will be displayed
as a percentage.
If @text is non-%NULL and [property@Gtk.ProgressBar: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
[property@Gtk.ProgressBar:show-text] is %TRUE.
Causes the given @text to appear next to the progress bar.
If @text is %NULL and [property@Gtk.ProgressBar:show-text] is %TRUE, the current value of [property@Gtk.ProgressBar:fraction] will be displayed as a percentage.
If @text is non-%NULL and [property@Gtk.ProgressBar: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 [property@Gtk.ProgressBar:show-text] is %TRUE.