[TIMOB-1601] iOS: Orientation change event occurs before rotation on landscape->portrait

from community,
1.using the provided code create an iPad or iPhone app
2.starting in landscape mode, slowly rotate

results:before the app UI changes over to portrait, the screen changes to white, meaning the orientation change handler fired prior to the actual event.

---

var mainWin = Ti.UI.createWindow({//url:"main.js",

                              title:'Decks',
                              barColor:"#333",
                              tabBarHidden: true
                              });

var decksTab = Ti.UI.createTab({title: "Decks", window: mainWin});
var tabGroup = Titanium.UI.createTabGroup({});
tabGroup.addTab(decksTab);
mainWin.tab = decksTab;
mainWin.tabGroup = tabGroup;
tabGroup.open();

mainWin.orientationModes = [

Titanium.UI.PORTRAIT,
Titanium.UI.LANDSCAPE_LEFT,
Titanium.UI.LANDSCAPE_RIGHT

];

Ti.Gesture.addEventListener(

'orientationchange', function(e) {
    if (e.orientation == Titanium.UI.LANDSCAPE_LEFT ||
        e.orientation == Titanium.UI.LANDSCAPE_RIGHT) {
        mainWin.backgroundColor = "#fff";
    } else {
        mainWin.backgroundColor = "#000";
    }
});