Files
scarf/scarf
Alan Wizemann a41c81c048 fix(chat): coalesce composer onChange writes to stop typing lag (#67)
Typing in the chat composer became unusably laggy because
`updateMenuState()` ran on every keystroke and unconditionally wrote
both `showMenu` and `selectedIndex`. Two state writes inside one
`onChange(of: text)` handler tripped SwiftUI's "action tried to
update multiple times per frame" warning, and each redundant write
forced a full body re-eval — visible as the slow-HID stalls and the
main-thread layout churn the reporter captured in sampling.

Two changes:

- Compute the new selection up front and write only the deltas. Same
  semantics; no spurious mutations.
- Short-circuit the whole handler when the user is composing normal
  text (no `/` prefix) and the menu is already hidden — the common
  case. Stops paying for `SlashCommandMenu.filter` on every keystroke
  of regular prose.
- Replace `.onChange(of: commands.map(\.id))` with
  `.onChange(of: commands.count)`. The mapped form allocated a fresh
  `[String]` on every body re-eval; counting is one int read.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-01 15:20:15 +02:00
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