Problem

incremental_app_eviction, prefer_scrub_eviction and skip_update_obsolete_check under eviction=(...) are accepted by WT_CONNECTION.reconfigure, but the eviction config parse only sets their flag in cache->cache_eviction_controls when the value is true and does nothing when it is false. Once one of them is turned on, reconfiguring it to false leaves it on.

test_cache_evict_config01.py reconfigures these options both ways but only checks that the connection still works, so it does not catch this.

Proposed change

• Clear the flag when the value is false, as eviction.bounded_wake does (WT-18961).
• Extend test_cache_evict_config01.py to check that each flag is actually cleared after reconfiguring it off, for example through a debug-visible statistic or a behaviour the option controls.

Definition of done

Turning each option on and then off with reconfigure leaves it off, and a test fails if the clear is removed.