[metacity] window: treat CurrentTime as legal timestamp in activation

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d0caba28c85ef9a08aa11322f435489acd550cf0
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Oct 20 17:39:23 2019 +0300

    window: treat CurrentTime as legal timestamp in activation
    
    Based on mutter commit:
    https://gitlab.gnome.org/GNOME/mutter/commit/5defe574d74eace55bfe9e

 src/core/window.c | 21 +++------------------
 1 file changed, 3 insertions(+), 18 deletions(-)
---
diff --git a/src/core/window.c b/src/core/window.c
index 08fd7996..97fa842c 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -3154,23 +3154,13 @@ window_activate (MetaWindow     *window,
                  MetaClientType  source_indication,
                  MetaWorkspace  *workspace)
 {
-  gboolean can_ignore_outdated_timestamps;
   meta_topic (META_DEBUG_FOCUS,
               "_NET_ACTIVE_WINDOW message sent for %s at time %u "
               "by client type %u.\n",
               window->desc, timestamp, source_indication);
 
-  /* Older EWMH spec didn't specify a timestamp; we decide to honor these only
-   * if the app specifies that it is a pager.
-   *
-   * Update: Unconditionally honor 0 timestamps for now; we'll fight
-   * that battle later.  Just remove the "FALSE &&" in order to only
-   * honor 0 timestamps for pagers.
-   */
-  can_ignore_outdated_timestamps =
-    (timestamp != 0 || (FALSE && source_indication != META_CLIENT_TYPE_PAGER));
-  if (XSERVER_TIME_IS_BEFORE (timestamp, window->display->last_user_time) &&
-      can_ignore_outdated_timestamps)
+  if (timestamp != 0 &&
+      XSERVER_TIME_IS_BEFORE (timestamp, window->display->last_user_time))
     {
       meta_topic (META_DEBUG_FOCUS,
                   "last_user_time (%u) is more recent; ignoring "
@@ -3180,13 +3170,8 @@ window_activate (MetaWindow     *window,
       return;
     }
 
-  /* For those stupid pagers, get a valid timestamp and show a warning */
   if (timestamp == 0)
-    {
-      g_warning ("meta_window_activate called by a pager with a 0 timestamp; "
-                 "the pager needs to be fixed.");
-      timestamp = meta_display_get_current_time_roundtrip (window->display);
-    }
+    timestamp = meta_display_get_current_time_roundtrip (window->display);
 
   meta_window_set_user_time (window, timestamp);