Fix crash when creating a task from an e-mail.
Sometimes, what you put in a KRichTextWidget isn't the same as what you get out. Line terminators (cr,lf) for example can be converted.

So, to see if the user changed something, we can't compare the original incidence with the new editor content.

Instead, we compare the new editor content, with the original editor content, this way any tranformation regarding non-printable chars will be irrelevant.