This change causes the locations list to be narrowed on all locator orb
checks, having the consequence of narrowing the list to the visibly
shaking location (for better display via `makeOverlayHint()'). The call
to `reset()' must be removed as it would re-add all locations to the
instance's solver when finding the dig location, which effectively
reverses the apparent narrowing the overlay displayed until that point.
29d786b948