[PyQt] QTextEdit based interpreter how to paste multiple lines of string?

[Han Jiang]

I have a embeded python interpreter which is qtextedit, I want it to have
the same behavior as  external python interpreter.

default interpreter:  http://imgur.com/sq7IeUH
my pyqt interpreter:  http://imgur.com/dM6Cian

there are several problems:
1.How do I make the text cursor stay at the line I was editing on, and not
follow my drag selection?  ( with QTextBlock userstate ? )

2.How can I made not editing lines read only, but the lines I am editing
editable? ( with QTextBlock userstate?)

3. How do I add ... to the beginning of lines if I paste multiple lines of
code inside? ( with eventfilter?)

the code is here :   https://github.com/oglops/pyshell
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