pub fn mark_tasks(occurrences: &mut [Occurrence], tasks: &[Task])Expand description
Time blocks shown as the tasks they are, in every agenda alike (the
window’s, the phone’s and the home card, 21 October 2026): a block of a
task known here says its task’s list; one whose task is not here (deleted,
its list off) is an event of its own, as the plan reads it
(blocks::without_blocks). Tasks themselves are never an agenda’s: one
shows only by its time block, an event that travels as events do.