David Edmundson authored Aug 14, 2023 and Vlad Zahorodnii committed Aug 21, 2023

Selection acts as an abstraction around multiple X11Sources, when we get
a new source we asyncronously emit that x11OffersChanged when it
completes.

If the selection is lost, we were just deleting the source, without
notifying other parts.

XwlDataSource is the datasource that SeatInterface knows about. We need
to delete this when the X11 connection is no longer valid. SeatInterface
will update the selection when the XwmlDataSource is deleted if it's the
active selection.

The hook is introduced as updating the selection in Clipboard will cause
Selection to delete m_xSource which gets messy.

BUG: 449909