How to fix manually Mobile IOS InputField overlapping Bug?

if you add multiline Textbox GUI you will discover a bug issue with te last row in the typing area (after keyboard IOS activated. the helper input area.) simply you cant focus the lat row. it cant be focused as shown in the image first section. so I saw some keyboard.mm files and some similar files after compile output. I know ObjectiveC but how can I fix this bug manually by modifying the objectiveC files in output ? I want the first buggy section similar design as the second section(as the image shown). is it possible ?
(thanks for opinions)

I’d say file a bug in the tracker.

This probably can’t be worked around and it’s pretty bad.