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fix(terminal): hide scrollbar and stop stale-frame wheel scroll for TUI tools

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The web terminal only hosts full-screen TUI tools (pi-agent, opencode),
which repaint in place in the normal buffer and do not use the alternate
screen or mouse tracking. With scrollback enabled, every repaint
accumulated as history, so xterm's viewport scrollbar appeared and the
mouse-wheel scrolled through stale frames instead of interacting with the
app; the scrollbar column also perturbed FitAddon's column count.

- terminal.tsx: set scrollback:0 and scrollSensitivity/fastScrollSensitivity:0
  so only the live viewport is kept (no bar, no stale-frame wheel jank).
- utilities.css: hide .xterm-viewport scrollbar (scrollbar-width:none +
  ::-webkit-scrollbar display:none) as belt-and-suspenders.

Wheel no longer scrolls stale frames; in-app scrolling uses the tool's own
keys. Headquarter-only change; no tool is touched.
This commit is contained in:
Developer
2026-07-11 12:07:47 +00:00
parent 996a858892
commit 468f34202a
2 changed files with 18 additions and 3 deletions
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apps/web/src/styles/utilities.css
+8
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@@ -938,6 +938,14 @@ a.nav-item,
overscroll-behavior: auto;
max-height: 100% !important;
width: 100% !important;
/* Full-screen TUI tools repaint in place; scrollback is 0 (see terminal.tsx).
Hide the viewport scrollbar so it never appears or captures input. */
scrollbar-width: none;
-ms-overflow-style: none;
}
.terminal-container .xterm-viewport::-webkit-scrollbar {
display: none;
}
/* On mobile the custom touch handler scrolls the buffer; disable native