Causes the given text to appear next to the progress bar.
If text is NULL and show-text is TRUE, the current
value of fraction will be displayed as a percentage.
If text is non-NULL and 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
show-text is TRUE.
Causes the given text to appear next to the progress bar.
If text is NULL and show-text is TRUE, the current value of fraction will be displayed as a percentage.
If text is non-NULL and 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 show-text is TRUE.