ewmh: correctly set _NET_ACTIVE_WINDOW

include/ewmh.h

@@ -20,4 +20,13 @@
  */
 void ewmh_update_current_desktop();
 
+/**
+ * Updates _NET_ACTIVE_WINDOW with the currently focused window.
+ *
+ * EWMH: The window ID of the currently active window or None if no window has
+ * the focus.
+ *
+ */
+void ewmh_update_active_window(xcb_window_t window);
+
 #endif

include/i3.h

@@ -21,7 +21,7 @@
 #ifndef _I3_H
 #define _I3_H
 
-#define NUM_ATOMS 19
+#define NUM_ATOMS 20
 
 extern xcb_connection_t *global_conn;
 extern xcb_key_symbols_t *keysyms;

include/xcb.h

@@ -62,7 +62,8 @@ enum { _NET_SUPPORTED = 0,
         UTF8_STRING,
         WM_STATE,
         WM_CLIENT_LEADER,
-        _NET_CURRENT_DESKTOP
+        _NET_CURRENT_DESKTOP,
+        _NET_ACTIVE_WINDOW
 };
 
 extern unsigned int xcb_numlock_mask;