The Codex terminal rendered only in the top half of the pane: FitAddon
divided the pane height by a too-tall cell box (measured before the
post-open WebGL renderer and the monospace font's real metrics resolved),
under-counted rows, and sent that short grid to zellij. It never recovered
because every remaining fit trigger after the settle window was the host
ResizeObserver, and the host's height:100% box never changes when only the
row count is wrong.
Add an onRender convergence loop: each renderer repaint re-proposes
dimensions from the current measured cell box and re-fits when they differ,
converging the grid to the true row count once metrics settle, then detaches
once stable (bounded by a re-fit cap). proposeDimensions returns undefined
until the cell box is non-zero, so a fit is never accepted from an unmeasured
cell. Also listen on window resize for OS-window / DPR changes that move the
true cell box without touching the host box.
Fixes#280
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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