append
Description:
Appends text to the list of strings stored in this.
Note:
Use [class@Gtk.DropDown]
If id is non-null then it is used as the ID of the row.
This is the same as calling [method@Gtk.ComboBoxText.insert] with a position of -1.
Parameters:
| this |
A `GtkComboBoxText` |
| id |
a string ID for this value |
| text |
A string |