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0e1f616
(Get the code!)
Because it has been requested like that to be. The docs say (somewhere in #95 at highlightPolicy) that no highlight in case there's no leading/trailing actions list, or action attached, or there's no active component in the list item. No highlight also means no click/pressAndHold.
Bug #1362305 also states that no animation (highlight) should happen if no action is attached to a list item. That means at least one of the above should match in order to have highlight, thus click happening.