The end of cover action as we know it
With the introduction of horizontal interface, it is clear that cover actions could no more work as they did, because the side swipe would interfere with cover actions.
Jolla solved it by reducing the number of cover actions to one (the reasoning is quite unclear) and changing the trigger to tapping (see this video) the area of the cover where the icon is.

Jolla's original moto, "we are moving away from tapping on tiny buttons" is no longer true, because that's exactly what is now necessary to trigger a cover action.

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