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I found SDL_GetWindowFromID() sometimes return NULL when I start qemu via ssh forwarding even the window has been crated already. I am not sure whether this is a bug of SDL, but we'd better check it carefully. Signed-off-by: Changbin Du <changbin.du@gmail.com> Message-id: 20200427132412.17909-1-changbin.du@gmail.com Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>