A sub-task tapped in a task's sheet opened a sheet of its own over it,
so Grocery List > Dairy > Milk stacked three. It now takes the sheet's
place, as the steps of the sheet's path already did (TaskTile's onOpen),
and the sheet keeps the tasks it showed: the system's back returns to
the last. Back is caught with a BackButtonListener, not a PopScope,
which would also hold back a tap beside the sheet, a swipe and Escape:
those close the sheet whole. A picker open over the sheet is closed by
back first.
Whats-New: A sub-task opens in its task's sheet instead of over it; back returns to the task.
Whats-New-De: Eine Unteraufgabe öffnet sich im Blatt ihrer Aufgabe statt darüber; Zurück führt zur Aufgabe.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>