Ensure the cursor delegate position is correct when wrapping.

Ensure the cursor delegate position is correct when wrapping.

When inserting text into a TextEdit with implicit width and wrapping
the cursor delegate position has to be updated after the width is
expanded to the implicit width otherwise it will be positioned in a
wrapped location.

Change-Id: Ibcb709ec1b4f6827ea8ae919f2e0c932c7372869
Reviewed-by: Martin Jones <martin.jones@nokia.com>