[Xmonad] Switching focus without pulling hidden windows into the foreground

Hi, I often have this scenario: - one editor window - one shell window

From the shell window I open a file in a third window, check some things and make notes in the editor. To have no space occupied by the shell I use the TwoPane layout then. (The editor as master, the file viewer as the only visible slave.)

The problem with it is that if I switch from editor to the viewer or vice versa the non-master window gets replaced by the shell window first, so that I need to focusDown several times. Is it possible to switch focus only between visible windows without pulling hidden ones into the foreground? Bye, Tassilo