The one behaviour that made scrolling the selection into view opt-in in
the first place — a background refresh must not yank the view back to a
selection the user scrolled away from — has never been covered by a test.
It's about to become the one case that the automatic scrolling has to
suppress, so cover it first.
Getting there needs two things from the test harness: mouse wheel events,
which are the only way to scroll a list panel without moving the
selection, and a way to trigger a background refresh. The periodic
routine that issues it is turned off in tests, and turning it on would
mean waiting for its timer and hoping it fires while we're looking, so
drive the refresh directly instead.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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