cancel
Description:
Emitted whenever a sequence is cancelled.
This usually happens on active touches when [method@Gtk.EventController.reset] is called on gesture (manually, due to grabs...),
or the individual sequence was claimed by parent widgets' controllers (see [method@Gtk.Gesture.set_sequence_state]).
gesture must forget everything about sequence as in response to this signal.
Parameters:
| sequence |
the `GdkEventSequence` that was cancelled |