[TIMOB-28394] iOS: openWindow transition broken / frame dropping (10.x regression)

   const window = Ti.UI.createWindow({
       backgroundColor: '#fff',
       title: 'Window 1'
   });
   
   const btn = Ti.UI.createButton({
       title: 'Trigger'
   });
   
   btn.addEventListener('click', () => {
       openWindow();
   });
   
   window.add(btn);
   
   const tabGroup = Ti.UI.createTabGroup({
       tabs: [
           Ti.UI.createTab({
               title: 'Tab 1',
               window
           })
       ]
   });
   
   tabGroup.open();
   
   function openWindow() {
       const window2 = Ti.UI.createWindow({
           backgroundColor: 'blue'
       });
       const container = Ti.UI.createScrollView({
           layout: 'vertical'
       });
   
       window2.addEventListener('open', function onOpen() {
           window2.removeEventListener('open', onOpen);
           load(container);
       });
       window2.add(container);
   
       tabGroup.activeTab.open(window2);
   }
   
   function load(container) {
       for (let i = 0; i < 100; i++) {
           container.add(Ti.UI.createView({
               top: 10,
               height: 200,
               backgroundColor: 'red',
               width: '90%'
           }));
       }
   
       var url = 'https://www.appcelerator.com';
       var client = Ti.Network.createHTTPClient({
           onload: function(e) {
               for (let i = 0; i < 1000; i++) {
                   container.add(Ti.UI.createView({
                       top: 10,
                       height: 200,
                       backgroundColor: 'yellow',
                       width: '90%'
                   }));
               }
           },
           onerror: function(e) {},
           timeout: 5000
       });
   
       client.open('GET', url);
       client.send();
   }
   

    master / 10_0_X  <—— not working!!
    0446f8e86a37d385718dcdbfeb3f9cf3a02e7178 - 29.01 <—— not working!!
    b22f6b79268885d85e5df6b715fb1eb16b659d95 - 15.01. <—— not working!!
    12e8d24001d8468d89ab2ef4d2a2e6e52f7f756f - 13.01. <—— not working!!
    a6082fd827f92e8132d933a8f288ecb867c3a035 - 04.01. <—— not working!!
    aa9c9b4e45ccde2f5f79ea105da26dce5c5f4d7e - 15.12. <—— not working!!
    c7e65a507a060f49ad4db10888ad9d1c2c7bd745 - 15.12 <—— not working!!
    
    |
    | < — Regression!! https://github.com/appcelerator/titanium_mobile/commit/c7e65a507a060f49ad4db10888ad9d1c2c7bd745
    |
    
    df14d0aa3663ba66b2499522bc909795db2c69db - 15.12. <—— working!!
    2cc7ded1d4c9fa3eebf0a5a0be46c19b9bd8256d - 09.12. <—— working!!
    de43774adebbe6de3bc830b4f276946b7e64ca93 09.12. <—— working!!
    0e41ce77c276ff42b49d9bd980de2fd2e4381815 - 08.12. <—— working!!