Fix: Check more carefully for cases where a rename can't be done #8658
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Attempting to rename an element of a tuple field would previously replace the type with the new name, which doesn't make sense; now it fails instead.
The check is done in both
prepare_rename
andrename
so that the case is caught before the user is prompted for a new name. Some other existing failure cases are also now additionally checked inprepare_rename
.Closes: #8592
(I threw in some doc edits for a relevant type; of course, I can remove those if the policy here is to be strict about scope of changes within a PR.)