[TIMOB-3341] iOS: navGroup closing window turns black before animation

When you have a navGroup and open a new window using it and then close the window using the navGroup the window turns black before the navGroup goes back. If you click the back button the window does not turn black before the navGroup goes back to the previous page.

Step 1: launch the sample code below
Step 2: tap the red window to open the blue window
Step 3: click the 'close' button on the blue window to go back to the red one
Step 4: notice that the blue window turns black before the slide animation back to the red window
Step 5: click on the red window again
Step 6: tap the left nav button
Step 7: notice that the blue window does not turn black before going back to the red window

app.js

var win = Titanium.UI.createWindow();

var win1 = Titanium.UI.createWindow({
    backgroundColor:"red",
    title:"Red Window"
});
win1.addEventListener('click', function(){
    nav.open(toolsWindow);
});

var nav = Titanium.UI.iPhone.createNavigationGroup({
   window: win1
});

var toolsWindow = Ti.UI.createWindow({
    title: 'Blue Window',
    url: 'tools_window.js',
    nav: nav,
    exitOnClose: false,
    backgroundColor: 'blue'
});

win.add(nav);
win.open();

tools_window.js

var win = Ti.UI.currentWindow;

var button = Ti.UI.createButton({
    title: 'close',
    height: 40,
    width: 300,

});
button.addEventListener('click', function(e) {
    Ti.API.info('clicked close');
    win.nav.close(win);
});

win.add(button);

Tested on

TiSDK 1.5.1, 1.6.0, iOS SDK 4.2

Associated Helpdesk Ticket

http://developer.appcelerator.com/helpdesk/view/76439">http://developer.appcelerator.com/helpdesk/view/76439