On IOS/iPad, I am unable to edit a space on the top line of text of a sign if I have already typed to the 3rd line. I am however, able to do this in a book by tapping where I want to move the typing cursor to. To be clear: I can edit the sign by tapping on it to reopen the sign menu, but have to delete text to return to a previous point in the signs 4 text lines 

This bug affects hanging and non-hanging signs

How to reproduce:

1 - open a new world on IOS 

2 - place a sign - hanging or normal

3 - type some words on the sign with a normal amount periodic spaces, do this until all 4 lines are filled

4 - exit sign menu

5 click on sign and try to edit something in the first, second, or third line of text

expected results: typing cursor will move to where you click and you will be able to edit text line 

observed results: typing cursor will not move at all, and will remain at the bottom of line 4