Sets the cursor to be shown when the pointer hovers over the widget.
This is a utility function that creates a cursor via [ctor@Gdk.Cursor.new_from_name] and then sets it on this with [method@Gtk.Widget.set_cursor]. See those functions for details.
On top of that, this function allows name to be `NULL`, which will do the same as calling [method@Gtk.Widget.set_cursor]
with a `NULL` cursor.
| this |
a widget |
| name |
the name of the cursor |