[TIMOB-18127] iOS: animating the textfield which is added to a tableview causes the keyboard to flicker

When a textfield is added to a tableview and when the height of the textfield is animated upon focus, the keyboard appears and immediately disappears. This would happen if you click on the textfield about 2-3 times and clicking/focusing the textfield several times would cause the keyboard to flicker. This is a regression as the keyboard appears properly with SDK 3.4.1 and it does not flicker if the textfield is focused continuously. However the error message indicated in step 2 under actual results is still reproducible in 3.4.1 Steps to reproduce: 1. Run the attached app.js 2. focus on the textfield 3. focus on the textfield several times continuously Actual Results: 2. Following error message is displayed:

[ERROR] :  focus 30
[ERROR] :  {
[ERROR] :      bubbles = 0;
[ERROR] :      cancelBubble = 0;
[ERROR] :      source = "[object TiUITextField]";
[ERROR] :      type = focus;
[ERROR] :      value = "";
[ERROR] :  }

and keyboard disappears immediately 3. Keyboard flickers. Expected Results: 2. No error message and keyboard should stay unless 'return' key is pressed. 3. Keyboard should not flicker