Yeah, "auto" would probably work this way and most people would just leave it like that.twipley wrote:Although I cannot see, at least under fullscreen mode, why would anyone want to prevent VirtualBox from automatically scaling to the highest-possible value, be it either fractional or integer.
I can think of one situation where you would want to set manual scale factor.
If it will be allowed to scale bigger than physical screen size. For example, you have a 1280x1024 monitor, but want to test something on a guest OS at 1920x1200. Guest could be shown with either sliders or forced to less-than 100% scaling.
Note that if < 100% scaling was forced in this case, things might be unreadably small. Instead, if scaling would be allowed with sliders, then one could also use it as an actual magnification feature, to observe a part of guest screen magnified.
VirtualBox is a laboratory for observing the guest so it makes sense that it would allow something like that.