When blitting inside one window, use ScrollWindowEx, and call

When blitting inside one window, use ScrollWindowEx, and call

	* gdk/win32/gdkdraw.c (gdk_draw_pixmap): When blitting inside one
	window, use ScrollWindowEx, and call UpdateWindow. This prevents
	bugs when for instance part of the window was outside the
	display. Thanks to Philippe Colantoni for finding and fixing this.