Partial Rendering

Come up with a simple way to do partial rendering so that certain items on the screen can smoothly update without affecting rest of the view

The issue names no files, tests, or entry points, so first map the existing screen-rendering flow and identify how views currently update. Define a reproducible case for updating selected screen items; done should mean those items update smoothly without affecting the rest of the view.

Written by the indexing model from the issue text.