the instance owning the signal handler to be found.
a properties object indicating whether to match by signal ID, detail, or callback function.
signal detail the handler has to be connected to.
the callback function the handler will invoke.
signal the handler has to be connected to.
A valid non-0 signal handler ID for a successful match.
Finds the first signal handler that matches certain selection criteria. The criteria are passed as properties of a match object. The match object has to be non-empty for successful matches. If no handler was found, a falsy value is returned.