Normally, when a Views field has been assigned both an exposed filter and a contextual filter, then both filters get applied to the View's results set -- always. This is not configurable behaviour. It's hard-coded.
As a consequence, contradictory search clauses easily occur, causing a counter-intuitive user experience with some White Screens of Disillusionment. Since the contextual filter sets the "bounds" for the page, any filtering by the visitor through the exposed filter on that page can only narrow down the results set, not broaden it. In other words the exposed filter appears not to be working properly.
This small module allows you to have a contextual filter argument apply only when there is no corresponding regular (exposed) filter value present.
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