i3 - improved tiling WM

Set EWMH active window to None when none has focus

Patch status: needinfo

Patch by Tony Crisci

Long description:

_NET_ACTIVE_WINDOW:

> The window ID of the currently active window or None if no window has
> the focus.

This fixes a bug that would not update _NET_ACTIVE_WINDOW when focus
changed to an i3 container without a window such as a branch or
workspace content container.

To apply this patch, use:
curl http://cr.i3wm.org/patch/561/raw.patch | git am

b/src/x.c

21 
@@ -1013,6 +1013,8 @@ void x_push_changes(Con *con) {
22 
                      to_focus, focused, focused->name);
23 
                 send_take_focus(to_focus, last_timestamp);
24
25 
+                ewmh_update_active_window((con_has_managed_window(focused) ? focused->window->id : XCB_WINDOW_NONE));
26 
+
27 
                 if (to_focus != last_focused && is_con_attached(focused))
28 
                    ipc_send_window_event("focus", focused);
29 
             } else {
30 
@@ -1030,7 +1032,7 @@ void x_push_changes(Con *con) {
31 
                     xcb_change_window_attributes(conn, focused->window->id, XCB_CW_EVENT_MASK, values);
32 
                 }
33
34 
-                ewmh_update_active_window(to_focus);
35 
+                ewmh_update_active_window((con_has_managed_window(focused) ? focused->window->id : XCB_WINDOW_NONE));
36
37 
                 if (to_focus != XCB_NONE && to_focus != last_focused && focused->window != NULL && is_con_attached(focused))
38 
                    ipc_send_window_event("focus", focused);
39 
@@ -1043,6 +1045,7 @@ void x_push_changes(Con *con) {
40 
     if (focused_id == XCB_NONE) {
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         DLOG("Still no window focused, better set focus to the root window\n");
42 
         xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, root, XCB_CURRENT_TIME);
43 
+        ewmh_update_active_window(XCB_WINDOW_NONE);
44 
         focused_id = root;
45 
     }
46