[XForms] Multiline input bug

[Lucas Sköldqvist]

Hi,

I've created a multiline input widget that uses the FL_FIXED_STYLE
style. If I use backspace to delete an empty line all the lines seem to
jump a step to the right and then jump back if I create a new line or
do some other things.

This only happens with fixed width fonts.

Regards,
Lucas