The question Delete Selection asks now passes the names of the sets it
names along with their indexes. ui.actionSet.delete deletes nothing and
returns an error when the set at an index no longer has that name, so a
set deleted or added above them while the question is open does not
make OK delete a different set. An index above the platform's usize
range is refused as "no such action set" instead of wrapping on 32-bit
builds.
dotCooCoo
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