(keymap_parent): New fun, extracted from Fkeymap_parent.
(Fkeymap_parent, keymap_memberp, fix_submap_inheritance): Use it. (Fset_keymap_parent): Gcpro a bit more. (access_keymap): Gcpro around meta_map call and around the main loop. (get_keyelt): Gcpro when following indirect references. (copy_keymap_item): New fun, extracted from Fcopy_keymap. (copy_keymap_1, Fcopy_keymap): Use it. Don't copy the parent map. (Fdefine_key, Flookup_key): Gcpro before calling get_keymap. Remove useless ad-hoc remap code.
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