fix(ios): navigationbar flicker issue

[vijaysingh-axway]

https://jira.appcelerator.org/browse/TIMOB-27894

[build]

	Messages
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📖	✅ All tests are passing Nice one! All 6575 tests are passing. (There are 696 skipped tests not included in that total)

Generated by 🚫 dangerJS against 792808a

[ssjsamir]

FR passed: Navigation bar no longer flickers using the following test case

var win3 = Titanium.UI.createWindow({
backgroundColor: 'blue',
title: 'Next Blue',
largeTitleEnabled: true,
});
 
var win1 = Ti.UI.createWindow({
backgroundColor: 'blue',
title: 'Blue',
largeTitleEnabled: true,
});
var button = Titanium.UI.createButton({
title: 'Open Next Blue',
});
button.addEventListener('click', function(){
tabGroup.activeTab.open(win3);
});
 
win1.add(button);
 
var win2 = Ti.UI.createWindow({
backgroundColor: 'red',
title: 'Red',
largeTitleEnabled: true,
});
win2.add(Ti.UI.createLabel({text: 'I am a red window.'}));
 
var tab1 = Ti.UI.createTab({
window: win1,
title: 'Blue',
}),
tab2 = Ti.UI.createTab({
window: win2,
title: 'Red'
}),
tabGroup = Ti.UI.createTabGroup({
tabs: [tab1, tab2]
});
tabGroup.open();
 

Test Environment

MacOS Catalina: 10.15.5 Beta
Xcode: 11.4
Java Version: 1.8.0_131
Android NDK: 21.1.6273396-beta2
Node.js: 10.16.3
""NPM":"5.0.0-1","CLI":"8.0.0-master.10""
iphone 8 13.4 sim