Earlier rounds shrank the SessionList by the dialog's row count to keep
the picker inside the viewport, but the SessionList could only claw back
whole session rows and bottomed out at zero entries. On a narrow
terminal with a long session title the dialog still wrapped past what
the SessionList could free, the picker overflowed the viewport, and the
TUI committed the header into native scrollback.
The picker now hosts the SessionList inside a single contentSlot
Container. Opening the delete confirmation swaps the dialog INTO that
slot (replacing the SessionList); closing it swaps the SessionList back.
The dialog therefore competes only with the SessionList's rendered
budget, not with the SessionList AND the picker chrome, so the picker
frame stays bounded by terminalRows even when the dialog wraps to many
rows. SessionList's external-reserve plumbing is no longer needed and is
removed.
Addresses PR #3285 second-round review feedback.
The first round of the issue #3283 fix reserved a fixed 12 SessionList
rows for the delete confirmation dialog. On a narrow terminal or against
a long session name, HookSelectorComponent's Markdown title and help
text wrap past 12 rows; the picker would still overflow even after the
SessionList shrank to zero entries, and the TUI committed the picker
header into native scrollback again.
SessionSelectorComponent now overrides render() to measure the dialog's
actual rendered height at the live width before super.render() walks
the children, and pushes that as the SessionList's external-row reserve.
The dialog's own Container memoization makes the extra pre-render
essentially free.
Addresses PR #3285 review feedback.
The delete-confirmation dialog mounted as a sibling below the picker's
bottom border briefly grew the picker past the terminal height. The TUI's
append-only renderer committed the picker's top rows (header + first
sessions) into native scrollback to fit the dialog within the viewport.
When the dialog closed and the picker re-rendered shorter, `windowTop`
stayed pinned at `#committedRows`, leaving the picker stranded below the
committed prefix — the user saw the header scrolled off the top.
SessionList now exposes `setExternalReserveRows`; SessionSelectorComponent
reserves the dialog's worst-case height while the dialog is mounted so
the picker's total rendered output stays within the terminal viewport
and the TUI never commits its rows.
Fixes#3283
roboomp