Function task_to_event 

pub(crate) fn task_to_event(
    qt: &CxxQtThread<Sioul>,
    shared: &Arc<Shared>,
    uid: &str,
    block: &str,
    edit: &str,
    calendar: &str,
) -> String

A task made an appointment: the event form edit (JSON) written in calendar (“account/id”; else the agenda’s usual), then the task taken out with its time blocks to come and block, the block it was opened from. Returns what went wrong, else “”.