set_markup_with_mnemonic
Description:
Sets the labels text, attributes and mnemonic from markup.
Parses str which is marked up with Pango markup (see [func@Pango.parse_markup]), setting the label’s text and attribute list
based on the parse results. If characters in str are preceded by an underscore, they are underlined indicating that they represent
a keyboard accelerator called a mnemonic.
The mnemonic key can be used to activate another widget, chosen automatically, or explicitly using [method@Gtk.Label.set_mnemonic_widget].
Parameters:
| this |
a `GtkLabel` |
| str |
a markup string |