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fix(tui): avoid main-screen scrollback reset loops

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LeonSGP43 2026-05-03 21:19:45 +08:00 • committed by Teknium
parent 31f22890ea
commit a494a614d0
2 changed files with 59 additions and 4 deletions
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46
ui-tui/packages/hermes-ink/src/ink/log-update.test.ts
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@ -30,10 +30,10 @@ const paint = (screen: Screen, y: number, text: string) => {
}
}
const mkFrame = (screen: Screen, viewportW: number, viewportH: number): Frame => ({
const mkFrame = (screen: Screen, viewportW: number, viewportH: number, cursorY = 0): Frame => ({
screen,
viewport: { width: viewportW, height: viewportH },
cursor: { x: 0, y: 0, visible: true }
cursor: { x: 0, y: cursorY, visible: true }
})
const stdoutOnly = (diff: ReturnType<LogUpdate['render']>) =>
@ -112,4 +112,46 @@ describe('LogUpdate.render diff contract', () => {
expect(stdoutOnly(diff)).toBe('')
expect(diff.some(p => p.type === 'clearTerminal')).toBe(false)
})
it('ignores main-screen scrollback-only changes instead of resetting repeatedly', () => {
const w = 20
const viewportH = 5
const h = 8
const prev = mkScreen(w, h)
paint(prev, 0, 'timer 1s')
paint(prev, 6, 'visible prompt')
const next = mkScreen(w, h)
paint(next, 0, 'timer 2s')
paint(next, 6, 'visible prompt')
next.damage = { x: 0, y: 0, width: w, height: h }
const log = new LogUpdate({ isTTY: true, stylePool })
const diff = log.render(mkFrame(prev, w, viewportH, h), mkFrame(next, w, viewportH, h), false, false)
expect(diff.some(p => p.type === 'clearTerminal')).toBe(false)
expect(stdoutOnly(diff)).not.toContain('timer2s')
})
it('keeps alt-screen full reset for unreachable scrollback row changes', () => {
const w = 20
const viewportH = 5
const h = 8
const prev = mkScreen(w, h)
paint(prev, 0, 'timer 1s')
paint(prev, 6, 'visible prompt')
const next = mkScreen(w, h)
paint(next, 0, 'timer 2s')
paint(next, 6, 'visible prompt')
next.damage = { x: 0, y: 0, width: w, height: h }
const log = new LogUpdate({ isTTY: true, stylePool })
const diff = log.render(mkFrame(prev, w, viewportH, h), mkFrame(next, w, viewportH, h), true, false)
expect(diff.some(p => p.type === 'clearTerminal')).toBe(true)
expect(stdoutOnly(diff)).toContain('timer2s')
})
})