Apply attributes to the label text.
The attributes set with this function will be applied and merged with any other attributes previously effected by way of the [ [email protected]:use-underline] or [[email protected]:use-markup] properties. While it is not recommended to mix markup strings with manually set attributes, if you must; know that the attributes will be applied to the label after the markup string is parsed.
| this |
a `GtkLabel` |
| attrs |