- fix/report deadlock in mediastreamer2/src/videofilters/msqogl.cpp:BufferRenderer::~BufferRenderer()
  Reproducer:
    Preferences -> Video
    click Video Preview
    press Space key
    press Space key again (repeating more often seems to increase the chance of the bug occurring)
    left-click "OK"
    then right-click on the tray icon and select "Quit"
    The program deadlocks in thread "linphone" in src/videofilters/msqogl.cpp:BufferRenderer::~BufferRenderer()
