Code review comment for lp:~widelands-dev/widelands/bug-1741779-map-description-edit-cutoff

I have tied the calculation to actual rendered font height now - this fixes the Editbox for me.

The problem in Multilineeditbox was the text_width function used by the WordWrap class - I have added a safeguard there too.

I have also opened a new bug for the tabbing order:

https://bugs.launchpad.net/widelands/+bug/1772561