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fix: improve mobile terminal alternate-screen detection and scrolling

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- Revert touch-action: none on .xterm-viewport so xterm.js can fall back
  to its own viewport scrolling when the custom handler doesn't take over.
- Detect alternate screen via reference equality
  (term.buffer.active === term.buffer.alternate) instead of the
  string, which could report normal buffer incorrectly.
- Lower vertical-scroll activation threshold from 4px to 2px and only
  prevent default once a vertical gesture is recognized.
- In normal buffer use term.scrollLines() so xterm.js handles the buffer
  scroll consistently; in alternate screen continue sending SGR 1006
  mouse-wheel sequences to tmux/vim.

Quality gates: typecheck, lint clean, npm test -- --run 87 passed.
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Developer
2026-06-13 20:42:52 +00:00
parent c7ab2de25e
commit 2ece7074f6
18 changed files with 59 additions and 61 deletions
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apps/web/src/components/features/terminal/.pi-map.index.md
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@@ -2,7 +2,7 @@
dir: apps/web/src/components/features/terminal
## role
Provides cross-platform terminal UI components with session management, special key input, and WebSocket-backed xterm.js integration for web-based terminal emulation.
Provides a cross-platform terminal emulator interface with WebSocket backend connectivity, supporting multiple sessions, special key input, and responsive desktop/mobile layouts.
## parent
index: apps/web/src/components/features/.pi-map.index.md
map: apps/web/src/components/features/.pi-map.md