edit_shortcuts_dispatch_to_the_engine dispatched secondary-z and
secondary-shift-z before a single run_until_parked; on Windows CI the
first key's binding hit was intermittently lost (undo 0, redo 1 —
twice, identically). Park after each key like every other assertion in
this test, and assert both reached the engine (>= 1) instead of the
exact pair count.
Mike-Solar
6946226a0a