var == FromTo.Frontend seems to have conflict with Displays "screen".

[guilleshop]

When applying var == FromTo.Frontend to fe.add_transition_callback, it appears that the Displays "screen" triggers the FromTo.Frontend event, when according to the documentation this is reserved for "First Start of the Frontend".

Example: This code will unfortunately trigger the " fe.set_display(3)" whenever going back to Displays menu (effectively not allowing me to go to the Displays menu at all). Ideally, this should only trigger fe.set_display(3) when first starting the frontend app.

See attached plugin for easy reproduce...
StartupDisplay.zip

fe.add_transition_callback("onTransition");

function onTransition( ttype, var, ttime )
{
    if ( ttype == Transition.StartLayout && var == FromTo.Frontend )
    {
        fe.set_display(3)
        return false;
    }
}