This is not a regression as it can be reproduced with studio 3.4.0 and sdk 3.4.1GA
String objects should not display the fromCharCode() method when content assist is invoked.
Steps to reproduce:
1. Insert the code:
2. Invoke content assist (ctrl + space)
fromCharCode() method is found as one of the options in content assist
Content assist should exclude the fromCharCode() method