Display - font loaded / error when the font you typed is not loaded

[MiguelDebruyne]

Right now when you type in a font you don't get any feedback if the font you typed is loaded or not. Since fonts change while still typing the name in, there could be times when people think they got the right font while in fact they got another font that has a part of the same name.

For example: If there is a font called Aria, you type in Aria but its actually loading Arial.
1: You don't see an error that "Aria" is not loaded
2: You don't see which font is loaded so you don't see that you got the wrong font except for esthetics of the font itself.

Also why is Trebuchet MS not working?