Focus goes to bottom of page

When executing cells in the notebook, one by one, the cell selector moves down the screen until it hits the bottom. It then remains there as more cells are executed.

Often, the bottom of the screen is not well visible (think, e.g., of classrooms) and even when it is, is uncomfortable to focus on.

Would it be feasible to have the notebook scroll automatically to make the active cell remain higher on the screen?

Reproduce the behavior in a notebook by executing cells one at a time and observing the active-cell selector as it reaches the bottom of the viewport. Trace the notebook UI code responsible for execution focus and scrolling, then verify that sequential execution keeps the active cell at a more comfortable position on screen.

Written by the indexing model from the issue text.