The guard refused any name of the stash's shape, so a visible name a person
had defined, such as _gc_rate_0, could not be edited or deleted from Name
Manager, which cannot pass force. It now refuses a name only when the
workbook holds a hidden workbook-scope item under it; a visible name of the
shape is the person's own, as the stash itself treats it. The test covers
such a name. The query comment says what the copy skip relies on: a query
runs nothing that changes the history.