Change the values displayed in the interface scale slider for consistency

[Calinou]

While browsing the menus in Red Eclipse 2.0.0, I noticed the user interface scale settings were 50%, 75%, 100%, 150% and 200%. I was curious why there wasn't 125% and 175% options. I tried using the 150% setting, but the change didn't seem that big compared to 100%.

It turns out the scale slider percentage is defined by the area, rather than a single dimension. This means that if you set the user interface scale to 150% (in Red Eclipse terms), each dimension is actually scaled to 123% (which is sqrt(1.5)).

Unfortunately, no other UI system I know of uses this kind of measurement, so I think it'd be better to use the size of a single dimension to follow the established convention (which is used by Windows, among other things). We can then add additional scaling options like 125% and 175%.

[ghost]

Yes you must pass from making sqrt(1.5) on both the width and the height if I'm not making any mistake I think to be right with conventional standards.