xwm: Redirect root window subwindows

xwayland no longer does this for us, we have to request it now

configure.ac

@@ -92,7 +92,7 @@ AC_ARG_ENABLE(xwayland-test, [  --enable-xwayland-test],,
 AM_CONDITIONAL(ENABLE_XWAYLAND, test x$enable_xwayland = xyes)
 AM_CONDITIONAL(ENABLE_XWAYLAND_TEST, test x$enable_xwayland = xyes -a x$enable_xwayland_test = xyes)
 if test x$enable_xwayland = xyes; then
-  PKG_CHECK_MODULES([XWAYLAND], xcb xcb-xfixes xcursor cairo-xcb)
+  PKG_CHECK_MODULES([XWAYLAND], xcb xcb-xfixes xcb-composite xcursor cairo-xcb)
   AC_DEFINE([BUILD_XWAYLAND], [1], [Build the X server launcher])
 
   AC_ARG_WITH(xserver-path, AS_HELP_STRING([--with-xserver-path=PATH],

src/xwayland/window-manager.c

@@ -1720,6 +1720,7 @@ weston_wm_get_resources(struct weston_wm *wm)
 	uint32_t i;
 
 	xcb_prefetch_extension_data (wm->conn, &xcb_xfixes_id);
+	xcb_prefetch_extension_data (wm->conn, &xcb_composite_id);
 
 	formats_cookie = xcb_render_query_pict_formats(wm->conn);
 
@@ -1887,6 +1888,10 @@ weston_wm_create(struct weston_xserver *wxs)
 		XCB_EVENT_MASK_PROPERTY_CHANGE;
 	xcb_change_window_attributes(wm->conn, wm->screen->root,
 				     XCB_CW_EVENT_MASK, values);
+
+	xcb_composite_redirect_subwindows(wm->conn, wm->screen->root,
+					  XCB_COMPOSITE_REDIRECT_MANUAL);
+
 	wm->theme = theme_create();
 
 	weston_wm_create_wm_window(wm);

src/xwayland/xwayland.h

@@ -23,6 +23,7 @@
 #include <wayland-server.h>
 #include <xcb/xcb.h>
 #include <xcb/xfixes.h>
+#include <xcb/composite.h>
 #include <cairo/cairo-xcb.h>
 
 #include "../compositor.h"