Simple update all monitors function so that any file can an update if they need to.

src/main.c

@@ -236,6 +236,13 @@ void monitor_update(struct Monitor *monitor) {
     pipeline_invalidate(monitor->pipeline);
 }
 
+void monitors_update(void) {
+    struct Monitor *monitor;
+    wl_list_for_each(monitor, &monitors, link) {
+        monitor_update(monitor);
+    }
+}
+
 void pipe_in(int fd, short mask, void *data) {
     running = 0;
 }

src/main.h

@@ -22,6 +22,7 @@ struct Monitor {
 };
 
 void panic(const char *fmt, ...);
+void monitors_update(void);
 struct Monitor *monitor_from_surface(const struct wl_surface *surface);
 
 extern struct wl_compositor *compositor;