Context for populating [class@HoverDisplay] contents.
`GtkSourceHoverContext` contains information about the request to populate contents for a [class@HoverDisplay].
It can be used to retrieve the [class@View], [class@Buffer], and [[email protected]] for the regions of text which are being displayed.
Use [[email protected]_bounds] to get the word that was requested. [[email protected]_iter] will get you the location of the
pointer when the request was made.