How To Fix Mouse Wheel Scroll Skipping In VirtualBox Linux Guests With X11 Desktop Environments (MATE, GNOME, KDE, or XFCE And Others)
If like me you've had enough of mouse scroll skipping in X11-based Desktop Linux Guest VMs, after years of searching I finally have the solution.
The Problem
In all Linux distros with any X11-based desktop environment that I've ever used in VirtualBox as guest OSes I've experienced the same infuriating issue: if I were to scroll the mouse wheel slowly (especially when scrolling up-down-up-down...) — the inputs would randomly get "eaten" for some reason. This led to them not being registered, which was extremely annoying, because I had no clue why this was the case only with the Linux guests, and never with Windows XP/7/10 ones.