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Problem: Several tag and attribute names are highlighted with regular
expression alternations even though they are plain words. A
:syn-match with an alternation is retried at nearly every
position of every tag.
Solution: Move the plain-word tag names (b, i, u, em, strong, head,
body, title, h1-h6) and the "label", "href" and "title"
attribute names into syn-keyword lists, leaving only the
genuinely hyphenated names "accept-charset" and "http-equiv"
as matches.
Profiling a 6000-line HTML file with :syntime, the converted rules drop
from a combined 0.044s to 0.004s, lowering total per-rule syntax time
by about 15%. Highlighting is unchanged except that a bare valueless
"href" attribute is now highlighted as an attribute, consistent with a
bare "title", which already behaved that way.
closes: vim/vim#21155
964a495bef
Co-authored-by: Julien Voisin <julien.voisin@dustri.org>
