enum PointerRelease

Runs something once, on the next release of the pointer.

For a press that means one thing if it turns into a drag and another if it does not. A press on one of several selected rows keeps them all selected, so they can be dragged together — and collapses the selection to that row only if the button comes back up without a drag. Unlike PointerCapture, waiting for the release takes nothing from the press: a file drag or a gesture still starts from it. The action runs after a drag's release too, so it has to check for itself whether it still applies.