- RenderState stores styles sparsely (per-cell u16 style ids plus one
Style per distinct run) and skips plain cells with a single mask test
(Cell::is_plain). screen-clone render: 11.5 ms -> 4.1 ms (Zig 4.7).
row::never_extend_bg now takes a style accessor instead of a slice.
- Parser::next_with(byte, |action| ..) hands actions to a closure
instead of moving a 64-byte action array out; Parser::next remains a
wrapper over the same core (equivalence test added).
terminal-parser SGR: 538 ms -> 231 ms (Zig 354).
All Ghostty benchmarks are now at or below Zig's time; table in
docs/rewrite/notes/perf-P1.md (the parser benchmark uses next_with with
a discarding closure, which like Zig's `_ = actions` lets the optimizer
skip unused work).
Test Plan:
- cargo test --workspace
- ghostty-bench +screen-clone --mode=render / +terminal-parser
ddidderr
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