Keep keyboard focus when alt-tabbing between applications

[wayfaringrob]

Right now if you flip between applications when editing an expression (among other areas here and there), you lose your keyboard focus. Infuriating, especially considering the relative lack of functionality in the Pro arcade editor compared to the web editor. The thing I'm flipping back and forth from is various Arcade documentation. Can you imagine if Microsoft Word took your cursor away every time you left the application?