select_region
Description:
Selects a range of characters in the label, if the label is selectable.
See [method@Gtk.Label.set_selectable]. If the label is not selectable, this function has no effect. If start_offset or
end_offset are -1, then the end of the label will be substituted.
Parameters:
| this |
a label |
| start_offset |
start offset, in characters |
| end_offset |
end offset, in characters |