Allow the player preview to update while being seeked/dragged [delivers #74952388]

Right. That was intentional. I just changed it to currentTime, and re-tested, and when I seek, it behaves like it does in 6.8, where it updates the display every second while seeking. I found that making it _position instead of currentTime make it even smoother than it was in 6.8. In fact, I think we might want to replace "_lastSeekTime = currentTime;" with "_lastSeekTime = _position;" in all cases, it is much smoother than before doing it this way. Let me know what you think.