Run "TZ=UTC0 admin/update-copyright".

* src/macfont.m (mac_font_get_glyphs_for_variants)
(macfont_variation_glyphs): Fix width values.  (Bug#64013)

Previously, free hash table entries were indicated by both hash value
hash_unused and key Qunbound; we now rely on the latter only.
This allows us to change the hash representation to one that does not
have an unused value.

* src/lisp.h (hash_unused): Remove.
All uses adapted to calling hash_unused_entry_key_p on the key instead.
The hash values for unused hash table entries are now undefined; all
initialisation and assignment to hash_unused has been removed.

This improves performance in several ways.  Separate functions are
used depending on whether the caller has a hash value computed or not.

* src/fns.c (hash_lookup_with_hash, hash_lookup_get_hash): New.
(hash_lookup): Remove hash return argument.
All callers adapted.

hash_lookup_with_hash hash_hash_t arg

This improves typing, saves pointless tagging and untagging, and
prepares for further changes. The new typedef hash_hash_t is an alias
for EMACS_UINT, and hash values are still limited to the fixnum range.
We now use hash_unused instead of Qnil to mark unused entries.

* src/lisp.h (hash_hash_t): New typedef for EMACS_UINT.
(hash_unused): New constant.
(struct hash_table_test): `hashfn` now returns
hash_hash_t.  All callers and implementations changed.
(struct Lisp_Hash_Table): Retype hash vector to an array of
hash_hash_t.  All code using it changed accordingly.
(HASH_HASH, hash_from_key):
* src/fns.c (set_hash_index_slot, hash_index_index)
(hash_lookup_with_hash, hash_lookup_get_hash, hash_put):
(hash_lookup, hash_put): Retype hash value arguments
and return values.  All callers adapted.

* src/macfont.m (CG_SET_FILL_COLOR_WITH_FRAME_CURSOR): New macro.
(CG_SET_FILL_COLOR_WITH_FRAME_BACKGROUND): New macro.
(macfont_draw): When the cursor's color matches the face background,
set the fill color of the cursor to the face foreground.
* src/nsterm.m (ns_maybe_dumpglyphs_background): When dumping the
background of a glyph string, apply the logic mentioned
above.  (Bug#62573)

eb11dae499 Improve documentation of column-related functions
c95a34c960 * src/macfont.m (macfont_open): Initialize font->space_wid...
31a6a37d45 Improve indexing of keymap variables