[PyQt] Segfault when trying newDoc.setDocumentLayout(QtGui.QPlainTextDocumentLayout(newDoc))

[GT6]

Hi there.

When running the below sample script, and clicking the button, it will
segfault, and I don't understand why or how. I've overwritten a function
in QPlainTextEdit and it should create a new document, set the
PlainTextDocumentLayout and then set the document on the QPlainTextEdit
widget. The important part is this (1st way):

        newDoc = QtGui.QTextDocument()
        newDoc.setDocumentLayout(QtGui.QPlainTextDocumentLayout(newDoc))
        self.setDocument(newDoc)

The above segfaults. I also tried this (2nd way):

            newDoc = QtGui.QTextDocument()
            newDoc.setDocumentLayout(self.documentLayout())
            self.setDocument(newDoc)

This one doesn't segfault, but I get this error:

AttributeError: documentLayout

Apart from that, I tried this third option (3rd way):

        newDoc = QtGui.QTextDocument()

newDoc.setDocumentLayout(QtGui.QPlainTextDocumentLayout.__init__(newDoc))
        self.setDocument(newDoc)

with the only difference from the first one being that __init__ is
called explicitly instead of expecting it to be defaultet. This one
_doesn't_ segfault, but gives this error:

QPlainTextEdit::setDocument: Document set does not support
QPlainTextDocumentLayout

Which makes no sense as not calling __init__ directly shouldn't be any
different than calling it explicitly. So, does anyone have any idea why
this is happening? Do you have a bug tracker?

Thanks and Regards,
Carl

Here's the complete code ready to be executed. I've commented out ways 2
and 3, you can comment the first one and try them out:


#!/usr/bin/python

import sys
from PyQt4 import QtGui, QtCore

class TextEditEnter(QtGui.QPlainTextEdit):
    def __init__(self, parent=None):
        QtGui.QPlainTextEdit.__init__(self, parent)

    def plzsegfault(self):
        newDoc = QtGui.QTextDocument()
        newDoc.setDocumentLayout(QtGui.QPlainTextDocumentLayout(newDoc))
# First way
        #newDoc.setDocumentLayout(self.documentLayout()) # Second way

#newDoc.setDocumentLayout(QtGui.QPlainTextDocumentLayout.__init__(newDoc))
# Third way
        self.setDocument(newDoc)

class MainWidget(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        self.setGeometry(400, 400, 200, 200)
        self.setWindowTitle('sample')
        grid = QtGui.QGridLayout()
        grid.setSpacing(10)
        self.textField = TextEditEnter()
        self.bt = QtGui.QPushButton('Segfault!', self)

        grid.addWidget(self.bt, 0, 0)
        grid.addWidget(self.textField, 1, 0)

        self.setLayout(grid)

        self.connect(self.bt, QtCore.SIGNAL('clicked()'),
self.textField.plzsegfault)

app = QtGui.QApplication(sys.argv)
mainWidget = MainWidget()
mainWidget.show()
sys.exit(app.exec_())