[QScintilla] Bug copying text on QScintilla

[Scener Spanish]

Hi, consider this snippet:

from PyQt5.Qt import *
from PyQt5.Qsci import QsciScintilla


if __name__ == '__main__':
    app = QApplication([])
    w = QsciScintilla()
    w.setText("hello world")
    w.show()
    app.exec_()

*Test1) *Run it, press ctrl+c, close the window and then open your system
clipboard viewer... for some reason on windows7 the is broken, you'll
binary content --> this
<https://dl.dropboxusercontent.com/s/gtf9cgg1cygbre4/clipbrd_2019-06-14_12-56-37.png>
. That
means you won't be able to paste the content on a text editor.

*Test2) *Run it, press ctrl+c and then open your system clipboard viewer,
in this case you'll be able to see the copied content correctly, like this
<https://dl.dropboxusercontent.com/s/8xq5riznnxs07cg/clipbrd_2019-06-14_12-59-06.png>
.

This issue has really annoyed me in the past many times but I didn't know
how to reproduce it or what was the reason why the content I'd copied from
my app couldn't be pasted anymore

*Requirements:*

windows 7 ultimate
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit
(Intel)] on win32

QScintilla==2.11.2.dev1905151033
PyQt5==5.12.2
PyQt5-sip==4.19.17
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