task scrub mode needs some polishing: - [x] better visual indication that it is active (eg: list of window icons below window previews?) - [x] the activation threshold is a bit too small on small devices making it hard to consistently activate - [ ] no way to go "infinitely far back" -> maybe when reaching the "end of the screen" start a timer after which it goes back one task per second? - [ ] revise activation logic -> eg: right now you can still flick if fast enough even if all other conditions work for scrubbing, but the flick needs to be "fast". since we don't have a reliable way of getting screen DPI at least on some devices that velocity limit could make the interaction feel weird and inconsistent. - [ ] add flick upwards gesture to dismiss scrub mode?