saving chat input as draft and editable cursor

when chat ui is closed with information entered via Exit/B button or external monster damage, save the chat entry so it will still be there when you reopen chat, can add the use of a clear/Y button to clear entry if needed, I been closed so many times by monsters it’s infuriating, would be also lovely to get a editable cursor to move around in the input field for books,chat, and especially command blocks... I have destroyed and replaced prob over a thousand command blocks by now just from typos or needing to adjust the r=# parameter or stuff.