Comment 77 for bug 1653351

(In reply to alta88 from comment #73)
> This feature has been implemented in the new (v78) Select Messages column; unchecking it will permanently prevent any auto selection in the folder. It is pretty much this patch, except the reviewers in Bug 1017904 didn't not get it. Note that using ctrl-click to unselect will continue to NOT work, the message must be unselected in the column checkbox.

Where is this setting located?