TUI.render merged live-region seams with a topmost-seam-wins rule that
adopted only that seam's pin policy for the whole frame. While the primary
turn streams, the transcript reports the topmost, unpinned seam, so the
frame-wide pin flag becomes false and a pinned AnchoredLiveContainer below
it (the /btw panel, the working HUD) loses its pinning: once its content
grows past the viewport, the emit path commits the scrolled-off rows as
frozen snapshots on every growth frame, piling duplicates into native
scrollback.
Track a pinnedBoundary (start row of the topmost pinned region)
independently of which seam wins the topmost merge, and cap every commit
ceiling at it. Equivalent to the prior behavior for a fully-pinned frame
and for a frame with no pinned region; only the mixed case changes.
Fixes#8793
isMultiplexerSession() treats TMUX, STY, ZELLIJ, HERDR_ENV=1, the CMUX_*
markers and a tmux/screen TERM as authoritative, and routes rendering down the
path that cannot rebuild scrollback. Nine tests across four files assert the
destructive full-paint behavior and fail for anyone running the suite inside
tmux, screen, Zellij or CMUX.
component-render.test.ts already cleared HERDR_ENV for exactly this reason but
covered only one of the nine signals. Replace it with a shared helper that
clears the whole family and restores it afterwards, and call it from the other
three files.
Kept full-root rendering as the default after input and introduced an explicit host opt-in for stable-focus subtree repainting. The coding-agent default composer opts in, while extension-provided editors and other TUI consumers retain callback-safe full composition.
Scoped ordinary input frames to the focused component while retaining a full compose when input moves focus. Explicitly repainted the coding-agent pending-message sibling and covered stable focus, wrapped growth, focus movement, and queue clearing.
Fixes#5928
Allowed fully live, uncommitted anchored status segments to use the direct-write path so the production working loader avoids the full render pipeline.
Added regression coverage for nested loaders inside anchored live status containers.
Added a direct-write path for quiet visible component segments so Loader animation rewrites only its known rows instead of scheduling the full render pipeline.
Updated Loader scheduling and regression coverage for direct-write fast paths and overlay fallback behavior.
Fixes#5192
roboomp