Do nothing in ShowWindow(SW_SHOW) if a window is already visible.
[wine] / dlls / d3dx8 /
drwxr-xr-x   ..
-rw-r--r-- 40 .cvsignore
-rw-r--r-- 334 Makefile.in
-rw-r--r-- 288 d3dx8.spec
-rw-r--r-- 2667 d3dx8_main.c
-rw-r--r-- 2963 d3dx8core_private.h
-rw-r--r-- 2567 d3dxbuffer.c