i3 - improved tiling WM

Bugfix: Set input focus with last timestamp

Patch status: merged

Patch by Tony Crisci

Long description:

Setting input focus with the last event timestamp prevents race
conditions when setting focus.

fixes #1127

To apply this patch, use:
curl http://cr.i3wm.org/patch/573/raw.patch | git am

b/src/x.c

17 
@@ -1026,7 +1026,7 @@ void x_push_changes(Con *con) {
18 
                     values[0] = CHILD_EVENT_MASK & ~(XCB_EVENT_MASK_FOCUS_CHANGE);
19 
                     xcb_change_window_attributes(conn, focused->window->id, XCB_CW_EVENT_MASK, values);
20 
                 }
21 
-                xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, to_focus, XCB_CURRENT_TIME);
22 
+                xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, to_focus, last_timestamp);
23 
                 if (focused->window != NULL) {
24 
                     values[0] = CHILD_EVENT_MASK;
25 
                     xcb_change_window_attributes(conn, focused->window->id, XCB_CW_EVENT_MASK, values);
26 
@@ -1044,7 +1044,7 @@ void x_push_changes(Con *con) {
27
28 
     if (focused_id == XCB_NONE) {
29 
         DLOG("Still no window focused, better set focus to the root window\n");
30 
-        xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, root, XCB_CURRENT_TIME);
31 
+        xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, root, last_timestamp);
32 
         ewmh_update_active_window(XCB_WINDOW_NONE);
33 
         focused_id = root;
34 
     }