[xmonad] How to get floating focused window on top?

[Juan Pedro Bolivar Puente]

Hello,

When dealing with focused windows like dialogs quite often a popup 
window appears *behind* the main window, stealing the focus. To get 
access to that window one has to move the main window to get to it. This 
is quite annoying and it could be easily solved if the focused window 
where kept on top of the floating windows stack. Is there any way to set 
this behaviour?

Thanks a lot,

JP