Field DAT cursor position for wordwrap

Please expose correct cursor position for text in a wordwrapped fieldDAT.

The correct cursor position must be available internally as characters appear at the correct place when wordwrapping, this should exposed as a CHOP.

Related to this bug
viewtopic.php?f=12&t=6443

and this discussion
posting.php?mode=reply&f=27&t=6400

The key missing info atm is knowing when cursor moves to start of newline (due to wordwrap algorithm)