Create a 2D window and then manually focus a different window on your desktop, call SDL_PumpEvents() so the X11 driver sets its this->hidden->switch_waiting, then set a fullscreen OpenGL window (which makes the X11 driver tear down and create a new window instead of just resizing the existing one), poll for events, and the newly-created window will think it needs to pop back to a window. Fixed by resetting switch_waiting to zero if X11_CreateWindow() had to tear down a previous window.

## Makefile.am for SDL using the nanox video driver

noinst_LTLIBRARIES = libvideo_nanox.la
libvideo_nanox_la_SOURCES = $(NANOX_SRCS)

# The SDL nanox video driver sources
NANOX_SRCS =         \
    SDL_nxmodes.c    \
    SDL_nxmodes_c.h  \
    SDL_nxmouse.c    \
    SDL_nxmouse_c.h  \
    SDL_nxvideo.c    \
    SDL_nxvideo.h    \
    SDL_nxwm.c       \
    SDL_nxwm_c.h     \
    SDL_nxevents.c   \
    SDL_nxevents_c.h \
    SDL_nximage.c    \
    SDL_nximage_c.h