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 MacOS X Quartz video driver

noinst_LTLIBRARIES = libvideo_quartz.la
libvideo_quartz_la_SOURCES = $(QUARTZ_SRCS)

# The SDL MacOS X Quartz video driver sources
QUARTZ_SRCS = 			\
	CGS.h			\
	SDL_QuartzEvents.m	\
	SDL_QuartzGL.m		\
	SDL_QuartzKeys.h	\
	SDL_QuartzVideo.h	\
	SDL_QuartzVideo.m	\
	SDL_QuartzWindow.h	\
	SDL_QuartzWindow.m	\
	SDL_QuartzWM.m		\
	SDL_QuartzYUV.m