[osg-users] getWindowingSystemInterface() fails on Ubuntu 18.04

[Omar Álvarez]

    osg::GraphicsContext::WindowingSystemInterface* wsi =
    osg::GraphicsContext::getWindowingSystemInterface();
    if ( !wsi ) {
        std::cout << "ERROR. Could not access the Windowing System
Interface" << std::endl;
        throw -1;
    }

    std::cout << wsi->getNumScreens() << " screen(s) detected" << std::endl;
    for ( unsigned int screen=0 ; screen < wsi->getNumScreens(); screen++ )
{
        osg::GraphicsContext::ScreenIdentifier screen_id(screen);
        osg::GraphicsContext::ScreenSettings screen_settings;
        wsi->getScreenSettings( screen_id, screen_settings );
        std::cout << "  Screen #" << screen << " : "
                  << screen_settings.width << "x" << screen_settings.height
<< " "
                  << screen_settings.refreshRate << "Hz "
                  << screen_settings.colorDepth << " bit" << std::endl;
    }

This simple code snippet fails for me on Ubuntu 18.04 (OSG 3.6.2 and 3.4.0)
with:

Invalid MIT-MAGIC-COOKIE-1 keyA Unable to open display ":0.0"
Invalid MIT-MAGIC-COOKIE-1 keyA Unable to open display ":0.0"
0 screen(s) detected
Invalid MIT-MAGIC-COOKIE-1 keyA Unable to open display ":0.0"

I have a dedicated NVIDIA GPU with latest drivers (396), running osgviewer
works properly. I also checked that getWindowingSystemInterface is being
called at the correct time. I have tested this after creating a viewer and
it also fails.

RegisterWindowingSystemInterfaceProxy()
X11WindowingSystemInterface()
GraphicsContext::setWindowingSystemInterface() 0x55aada1ee9d0
0x7f69e2fc9978
GraphicsContext::getWindowingSystemInterface() 0x55aada1ee9d0
0x7f69e2fc9978

Another thing that makes no sense is that my X session is not :0.0 but
:1.*, but no matter what $DISPLAY environment variable has, it is ignored,
it is looking for screens in the wrong X session. At this point I don't
know what else to try. Am I doing something wrong? Any ideas?
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