Nine tests, and the header says which of them reproduce the defect:
three do, and the other six cannot. "The entry is not orphaned" and "a
docked column is not in the stack" are both vacuously true of a build
that pushes no entry at all. That was established by reverting the
source and re-running, not assumed.
The containment assertion is the one worth reading twice. It asks
where the panel *is* rather than whether a menu is clipped, because
CI's Chromium and WebKit both have the Popover API -- so the symptom is
invisible here and a spec asserting "not clipped" is green on the
broken build. `.planning/NOTES.md` states the mechanism.
The rest assert the entry rather than `aria-expanded`, which is the
shell's own bookkeeping and was right throughout the defect: what has
to be true is that one back press closes the queue and the *next* one
navigates.
logan
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