Created attachment 298 [details]
Sample demonstrating incorrect refcount

while debugging some memory issues we are having I noticed that there is a
large number of QTextBlockUserData objects still around even after anything
that could still reference them was long gone. As it seems every time
QTextBlock::userData() is called the refcount goes up by one (even if you
discard the result).
The same problem seems to exist when using
QSyntaxHighlighter::currentBlockUserData()

I'll attach a minimal sample that demonstrates the problem