Two faults, one behind the other.
RDAPanel is nested inside SettingsModal so it can read its state, and it
was written as <RDAPanel />. A nested function is a new component TYPE on
every render: React cannot know it is the same panel, so it unmounted the
tree and mounted a fresh one — and a fresh scroll container starts at the
top. It is called now, like the other panels, which produces the same
elements in place and never disturbs the scroll position.
What it was reacting to should not have reached it either. The PSK
Reporter and grid-cache poll ran every three seconds from wherever you
were in Preferences, re-rendering the whole dialog for a count shown only
on the cluster section. It now runs while that section is open, and the
one-time loads it was sharing an effect with have stayed where they were
rather than refetching on every click in the sidebar.
The visible result: a hundred contacts to correct can be read from top to
bottom.
rouggy
4441b16699