xwayland: add wlr_xwayland_get_xwm_connection

Allows the compositors to get the xwm connection

include/wlr/xwayland/xwayland.h

@@ -298,4 +298,15 @@ enum wlr_xwayland_icccm_input_model wlr_xwayland_icccm_input_model(
 void wlr_xwayland_set_workareas(struct wlr_xwayland *wlr_xwayland,
 	const struct wlr_box *workareas, size_t num_workareas);
 
+
+/**
+ * Get the XCB connection of the XWM.
+ *
+ * The connection is only valid after wlr_xwayland.events.ready, and becomes
+ * invalid on wlr_xwayland_server.events.destroy. In that case, NULL is
+ * returned.
+ */
+xcb_connection_t *wlr_xwayland_get_xwm_connection(
+	struct wlr_xwayland *wlr_xwayland);
+
 #endif

xwayland/xwm.c

@@ -2380,3 +2380,8 @@ void wlr_xwayland_set_workareas(struct wlr_xwayland *wlr_xwayland,
 			XCB_ATOM_CARDINAL, 32, 4 * num_workareas, data);
 	free(data);
 }
+
+xcb_connection_t *wlr_xwayland_get_xwm_connection(
+	struct wlr_xwayland *wlr_xwayland) {
+	return wlr_xwayland->xwm ? wlr_xwayland->xwm->xcb_conn : NULL;
+}