The text pattern here is to minimize the list so you can select and deselect which will affect the VIZ ... if you want to apply the text pattern on the VIZ directly you can change the filter type to (Wildcard Match) ...
Yes I understood that to be the case from my explorations yesterday. Excel manages to do both in its autofilters, but perhaps that is a simpler scenario programatically. Thanks for your reply. And thanks Tableau.