extra_drag_value

This signal is emitted when the dropped content is preloaded.

In order for data to be preloaded, [property@TabBar:extra-drag-preload] must be set to `TRUE`.

The content must be of one of the types set up via [method@TabBar.setup_extra_drop_target].

See [property@Gtk.DropTarget:value].

Parameters:

page	the page matching the tab the content was dropped onto
value	the `GValue` being dropped

Returns:

the preferred action for the drop on page