Memory leak when using boudingRect on QThread

Hello,

A memory leak is present when calling the boundingRect function in QFontMetrics (as well as drawText from QPainter) in a QThread.  In analyzing the source code for the two functions, I noticed they both made QStackTextEngine objects which are referenced in this bug report https://bugreports.qt.io/browse/QTBUG-24685 as causing a leak in version 4.7.4 and 4.8.  Supposedly the bug was fixed in 4.8.3 but it seems to be occuring in version 4.8.6 as well. I have attached images showing the memory increase when calling boundingRect with a QString of len == 0 (which returns the function before creating a QStackTextEngine and manipulating it) and one with  a QString of len != 0.  The first one has a RAM usage that is constant whereas the second has a RAM that increases steadily.

In the images, the process concerned is called "Exemple"

My question is, has this leak been corrected in a newer version or is it still a bug in Qt?

Thank you in advance.