> Notably, modern OSes can be pretty finicky about menu drill downs and outright user hostile. It’s pretty easy to lose an entire drill down by moving the mouse

> Notably, modern OSes can be pretty finicky about menu drill downs and outright user hostile. It’s pretty easy to lose an entire drill down by moving the mouse a couple pixels one or another way too far, for instance. The Mac basically solved this problem in 1986 when Apple first introduced hierarchical menus. To make it work, the UI layer has to be able to avoid strict hit testing of the mouse cursor during menu tracking, which I would conjecture is probably difficult in some environments.