On a phone the terminal clipped on the right: FitAddon measured the column count before
JetBrains Mono finished loading (narrower fallback metrics → too many columns → the wider real
font then overflowed and the right edge was cut). And the PTY opened at a fixed 80x24, so the
remote shell's first screenful (MOTD/prompt) was generated at 80 columns and wrapped awkwardly
on a ~43-column viewport.
- refit immediately, on the next animation frame, and again on document.fonts.ready (font race)
- refit on the 'ready' frame before sending the size
- pass the browser's cols/rows on the WS URL; the sidecar opens the host PTY / SSH shell at that
size (clamped 1..1000), so output is born at the visible width
Verified in-browser at 390px: PTY reports 43x23 (matches the box), no horizontal overflow, clean
wrapping, zero console errors; desktop server+host terminals and cross-origin rejection still pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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