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to pass Qnil for NOERROR.

* keymap.c (current_minor_maps_error): Remove.
(current_minor_maps): Pass Qt for NOERROR to Findirect_function
instead of using internal_condition_case_1+current_minor_maps_error.

sort them, then output a sequence of identical bindings on one line.
(struct describe_map_elt): New data type.
(describe_map_compare): New function.

(Flookup_key): Doc fix.
(syms_of_keymap) <function-key-map>: Doc fix.

(Vminibuffer_local_must_match_filename_map): New variables.
(syms_of_keymap): DEFVAR_LISP them, initialize them, and set their parent to
be Vminibuffer_local_completion_map and Vminibuffer_local_must_match_map,
respectively.

call it again with a sub-key-sequence, and if its return value
is non-nil (sub-key is bound), return nil.

after insert which runs signal_after_change.

(describe_map, describe_vector): Likewise.  When it's 1,
don't omit shadowed bindings, instead mark them as shadowed.

if Voverriding_terminal_local_map is non-nil.

map-keymap-internal to implement that.

(syms_of_keymap) <key-translation-map>: Doc fixes.

(Fkey_description, Fglobal_key_binding): Fix typo in docstring.

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.

(syms_of_keymap): Add mouse-[45], header-line, and mode-line to it.