Update, quote from #qt-quick
(09:59:18 AM) ThomasZ: zsombi: "EchoOnEdit" means its visible while editing. Editing stops until it looses focus.
(09:59:25 AM) ThomasZ: zsombi: it does what it says it should do
So, showing only the last entered character (like in iOS) is not possible.
Update, quote from #qt-quick
(09:59:18 AM) ThomasZ: zsombi: "EchoOnEdit" means its visible while editing. Editing stops until it looses focus.
(09:59:25 AM) ThomasZ: zsombi: it does what it says it should do
So, showing only the last entered character (like in iOS) is not possible.