I've got mine ;-)
File "editor.py", I'd replaced the "deleteLines()" method by this one :
def deleteLines(self):
cursor = self.textCursor()
text = cursor.block().text()
start = cursor.selectionStart()
cursor.setPosition(start)
cursor.movePosition(cursor.StartOfBlock)
cursor.insertText( text+"\n")
It's an horrible hack, but it works
and nobodies use the deleteLines() features