[QScintilla] Mouse event filter for QsciScintilla

[VA]

Hi,

It seems there's a bug with QsciScintilla widgets because they do not 
receive mouse press events, so it's not possible to have an event filter 
for mouse presses.

With this code sample, 'clicked' is never printed when clicking the text 
widget:

from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.Qsci import *

class Filter(QObject):
	def eventFilter(self, target, ev):
		if ev.type() == QEvent.MouseButtonPress:
			print('clicked')
		return False

app = QApplication([])
f = Filter()
sci = QsciScintilla()
sci.installEventFilter(f)
sci.show()
app.exec_()