(describe_map_tree): Insert key_heading here.
New arg TITLE. (describe_buffer_bindings): Corresponding changes. (shadow_lookup): New function. (describe_map_2): Call it. SHADOW is now a list of maps. (describe_vector): Likewise. (describe_map): SHADOW is now a list of maps. (describe_map_tree): Likewise. (describe_buffer_bindings): Build suitable list to pass as SHADOW. (Faccessible_keymaps): New arg PREFIX. Callers changed. (describe_map_tree): New arg PREFIX. (Fdescribe_bindings): New arg PREFIX. Pass to describe_buffer_bindings along with buffer. (describe_buffer_bindings): Extract PREFIX and pass along.
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