version 3 by Jon Ingold
Section 4 - Toggling Input Style
Inputstyling is an action out of world.
Understand "inputchange" as Inputstyling.
Carry out Inputstyling:
if the interactive parsing override option is inactive:
if the current text input window is the main-window:
open up the key-window as the main text input window;
now the current text input window is the main-window;
shut down the key-window.