(Fkey_description): Add optional PREFIX arg.
Combine prefix with KEYS to make up the full key sequence to describe. Correlate meta_prefix_char and following (simple) key to describe as meta modifier. All callers changed. (describe_map): Rename arg `keys' to `prefix'. Remove local `elt_prefix' var. Use Fkey_description with prefix instead of elt_prefix combined with Fsingle_key_description. (describe_vector): Declare static. Replace arg `elt_prefix' with `prefix'. Add KEYMAP_P arg. Add local var `elt_prefix'; use it if !KEYMAP_P. Use Fkey_description with prefix instead of Fsingle_key_description.
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