QPlatformTextureList leak when using QOpenGLWidget

I noticed this when I created a simple dialog with a QOpenGLWidget that could be closed and re-opened anytime.
Everytime I closed the dialog it wouldn't free all the memory it had initially allocated.

So I decided to make a little test case here, which rapidly opens and closes such a dialog:
http://pastebin.com/a83pNgHb

Memory leak trace (see attachment) courtesy of a certain person on the IRC channel confirms it's not a system-specific thing.
The leaked elements seem to be mostly QPlatformTextureList