porterbot

Looks like some kind of initialization exception when the color sliders are not open when the Zarr Sample is loaded. If you open or close the color sliders window after...

Just double-checking the commit for [6af37e7](https://github.com/JaneliaSciComp/workstation/pull/44/commits/6af37e790969e42e196bca3bbbb80e8e83e89c1b), did you basically just move the prefetching logic to only start working if the SharedVolume is loaded (3D view is started)? I don't see...