There's no way to stop GTK from changing the selection in the keyboard
layout and variant views during keyboard navigation. Currently the
keyboard layout is changed when the 'changed' signal is emitted on the
tree selection. I think the best approach would be to change the
keyboard layout when either of the following events happen:

  * the 'focus-out-event' signal is emitted on either tree view widget (either 
by tabbing to or selecting another widget, or (I think) by alt-tabbing to 
another window);
  * the Forward button is pressed (either directly or by activating a row in 
either tree view widget).

This should arrange to change the layout when it actually needs to be
used, but without interfering with keyboard navigation.

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Keyboard layout choice in installer confusing
https://bugs.launchpad.net/bugs/173950
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