The thread's bottom clearance is composer + status-stack + 2rem, and both
inputs are measured by JS onto the owning [data-chat-surface]. The surface-var
helpers fell back to document.documentElement when they couldn't resolve one —
but :root is where every surface's DEFAULTS live, so a single stale write there
becomes a global floor under every thread's clearance until reload.
An unowned publisher has nowhere to publish to, so it now publishes nowhere.
Brooklyn Nicholson
800c8a0458