Clicking a row's checkbox with Shift held takes every row between it and
the last one toggled to the state the click produced, so a stretch of a
long queue can be cancelled without ticking each entry.
The range follows the order the rows are rendered in, which for the
Completed list is the sort the user picked rather than the order the map
holds; the master checkbox takes that order as an input. An anchor whose
row has since left the list (a download finishing moves it to Completed)
falls back to a plain toggle.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
tjelite1986