(I *think* the reason Google did this is because they realized that if people were able to customize or replace the nav bar, they might wind up disabling Google Assistant or— horror of horrors!— replacing Google Assistant with an alternative made by a competitor. That had to be stopped, so the alt-navbar economy had to be executed, and the way they did this was killing `wm overscan`, so this meant also taking away my ability to hack my screen to be rectangular. Infuriating.)