add_selection_clipboard
Description:
Adds clipboard to the list of clipboards in which the selection contents of this are available.
In most cases, clipboard will be the `GdkClipboard` returned by [method@Gtk.Widget.get_primary_clipboard] for a view of
this.
Parameters:
| this |
a `GtkTextBuffer` |
| clipboard |
a `GdkClipboard` |