Ticking or unticking the column hiding tickboxes on batch edit/delete causes the wrong columns to be hidden.
To test, duplicate this:
Created attachment 4546 [details] [review]
Minor T:T variable error.
This patch works, but the title isn't showing anymore - before the patch the title would show if you checked a box off ... now the title isn't there at all. Marking failed QA because we need the title to show as one of the columns so we know what we're editing.
It was a cookie issue.
Simple fix for T::T, pushed please test