[QScintilla] Main selection color is not changed properly in some cases

[Scener Spanish]

Few days ago I've opened a thread on scintilla forum
https://groups.google.com/forum/#!topic/scintilla-interest/S3Z9Yl8gewQ talking
about this bug.

At first I assumed it was related to Scintilla but the bug doesn't show up
on Scite so... maybe this is a QScintilla specific bug?

Tested on python3.6.x + win7 + PyQt5==5.12

and both QScintilla==2.10.8 or QScintilla==2.11.1

Can you reproduce and advice? If not, please let me know and I'll create a
proper mcve.

Thanks in advance
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