QPainter(QPrinter())->end() call creates unclosed but deleted files in /tmp without cleanup (Unix)

QPainter together with QPrinter leaves a lot of temporary files in /tmp with every printout. That is a problem for embedded devices, which have not such a large /tmp-partition. We are using 80 MByte as tmpfs, i.e. in RAM. After some printounts cups deactivates the printer because there is no space to copy the temporary files to /tmp.

What we are doing:
We are using QPrinter, QPainter and QGraphicsScene to printout scaled forms like

QPainter *printPainter = new QPainter;
QPrinter *printer = new QPrinter;
Form2Print *f2p = new Form2Print;
printPainter->begin(printer);
// some scene stuff to add widgets, not relevant...
printPainter->end();

If you debug, you will see, that before calling printPainter->end() with "lsof /tmp" you get a opened file, and after calling printPainter->end() you have a zombie, i.e. a non-closed but removed file with a "(deleted)" at the end. You will not see this files with ls.

I add an entire small project for you to demonstrate that.

What I found out is:
In all versions 4.4.2, 4.5.3, 4.6.2 and 4.7.0 it is the same.

In my opinion the problem is:
QPainter->end() calls d->engine->end() (which is an QPSPrintEngine)
There QPDFPrintEngine::end() will be called, which calls QPDFBaseEnginePrivate->closePrintDevice()

And there it happens: At the begin of the file "outDevice->close()" and "delete outDevice" are called, than there is some access to the file BUT at the end of the method there is a static call of QFile::remove(tempFile).

Sugestion: move "outDevice->close()" and "delete outDevice" call to the end of the file and in between call
QFile outfile = qobject_cast<QFile> (outDevice);
if (outfile)