[TIMOB-4355] iOS: barImages Stack (and Never Go Away)

Problem

If you specify a barImage on a window in a nav group, that image never goes away. Subsequent images will stack. Nav bar contents like titles or buttons will show up behind them.

Sample Code

Drop the following in an app.js. It only needs "appicon.png" in your resources directory. To reproduce: 1. Look at the nav bar (it is OK) 2. Touch "Open Child 2" 3. Touch "Child 1" (it's a back button in the top left) 4. Look at the nav bar (the bar image from the child is there) 5. Rotate the device 90 degrees 6. Touch "Open Child 2" 7. Look at the nav bar (the portrait bar image is there, plus a new landscape bar image, and the title is hidden)

var parent = Ti.UI.createWindow({
    navBarHidden: true, modal: true
});

var child1 = Ti.UI.createWindow({
    title: 'Child 1'
});
child1.setRightNavButton(Ti.UI.createButton({
    systemButton: Ti.UI.iPhone.SystemButton.DONE
}));

var nav = Ti.UI.iPhone.createNavigationGroup({
    window: child1
});
parent.add(nav);

var openNewChildButton = Ti.UI.createButton({ title: 'Open Child 2' });
openNewChildButton.addEventListener('click', function() {
    var child2 = Ti.UI.createWindow({ title: 'Child 2', barImage: 'appicon.png', barColor: '#000' });
    nav.open(child2);
});
child1.add(openNewChildButton);

parent.open();

Possibly Related To

[TIMOB-2834]

Associated Helpdesk Ticket

http://appc.me/c/APP-115938