If paper color isn't white, there are ?flicking? when drawing some things.
How to reproduce:
Open QScintilla (Monkey Developer Studio for example)
Select Red paper color, and switch on brackets highlighting.
Place keyboard cursor near the some bracket ...
(it's must be highlighted)
if ( QMessageBox::question( w, c, s, b, d ) == QMessageBox::Yes )
Than press Up. Line where cursor was, and line where cursor are now will be erased by White color, and than drawed again. Visible by eye
I used QScintilla-gpl-2-snapshot-20070722 on Qt4.3 (Linux)
For questions about or for getting Monkey Developer Studio, where I finded the problem I availible on