Serializes a `PangoAttrList` to a string.
In the resulting string, serialized attributes are separated by newlines or commas. Individual attributes are serialized to a string of the form
[START END] TYPE VALUE
Where START and END are the indices (with -1 being accepted in place of MAXUINT), TYPE is the nickname of the attribute value type, e.g. _weight_ or _stretch_, and the value is serialized according to its type:
Optionally, START and END can be omitted to indicate unlimited extent.
Examples:
0 10 foreground red, 5 15 weight bold, 0 200 font-desc "Sans 10"
0 -1 weight 700 0 100 family Times
weight bold
To parse the returned value, use [func@Pango.AttrList.from_string].
Note that shape attributes can not be serialized.
| this |
a `PangoAttrList` |
|
a newly allocated string |