When you copy lines from a QTextEdit/QPlainTextEdit (e.g. via the context menu) and paste the clipboard in some other application, e.g. to the console or vim, the newlines got replaces by a unicode character.

I found that QTextEditMimeData now uses the QTextDocumentFragment::toRawText() to set the "plain" text where in older versions (6.3) QTextDocumentFragment::toPlainText() was used providing the desired results in other (non-qt?) programs.