Commands whose description takes `ids` (operate on these objects;
default: the selection) failed with "nothing selected" when objects
were given but none was selected: execute checked their `enabled`
predicate against the selection, with an exception for edit.clear only.
Of the 220 commands mentioning ids, 48 were refused so; their run
already used the ids. execute now evaluates `enabled` with the given
ids selected and puts the selection back, so each predicate keeps its
meaning (Make with Top Object still needs two objects).
Fixes#1575
skylar taylor-barrick