[MCPE-149377] Bold text clips out of chat background

How to reproduce

Type this into chat:

§laaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Press enter

Observe

On the middle three lines, the letters go past the horizontal bounds of the background.