commit 1c27a69131428e9e733374c2a3676ca4ecee45d2
Author: Kimball Thurston <kdt3rd@gmail.com>
Date:   Tue Dec 22 21:46:17 2015 -0800

    Fix focus handling with multiple awesome instances
    
    When there are multiple X11 screens (i.e. :0.0 and :0.1) for zaphod mode
    style X setups, this triggers a refresh of focus when the instance
    running on a particular root receives the mouse
    
    Fixes https://github.com/awesomeWM/awesome/issues/599.

diff --git a/event.c b/event.c
index db70e2c..80d6bd6 100644
--- a/event.c
+++ b/event.c
@@ -554,6 +554,12 @@ event_handle_enternotify(xcb_enter_notify_event_t *ev)
         }
         lua_pop(globalconf.L, 1);
     }
+    else if (ev->event == globalconf.screen->root) {
+        /* When there are multiple X screens with awesome running separate
+         * instances, reset focus.
+         */
+        globalconf.focus.need_update = true;
+    }
 }

 /** The focus in event handler.