[Sugg] Compare by content,Editmode: Title add * when changed

[StatusQuo]

In Editmode of Compare Content: If you have changed something in one of the files,
the text boxes containing the file names are greyed out. So far, so good.

I would find it nice to additionally change the title by appending " *" to it, to show that unsaved changes are made
(behaviour I'm used to from some other editors).