Two independent clobbers threw the choice away, so "hide header" never
survived a close/reopen cycle.
normalize() deleted headerHidden whenever a zone dropped to one pane, on
the grounds that a lone zone is headerless by default. It is — but the flag
is the user's standing preference for that zone, not a redundant value, and
dropping it meant the bar returned the moment a pane rejoined (close the
stacked logs pane, toggle it back).
Re-adoption then pinned headerHidden false unconditionally. That is right
for a pane arriving somewhere new, where zero chrome leaves no handle to
drag or close, and wrong for a zone whose bar the user deliberately hid.
Adoption now carries the destination zone's own setting, read before the
insert since insertAtGroup pins the flag itself on a center drop.
Brooklyn Nicholson
4802d2d88d