From 4193b2406f635b79227c49058f43d44ac7d6fe0f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Fri, 2 Aug 2013 08:42:33 +0200
Subject: [PATCH] Use XCB to query the window tree in xStackingOrder

---
 layers.cpp | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/layers.cpp b/layers.cpp
index 18d35a7056..619b1e1efc 100644
--- a/layers.cpp
+++ b/layers.cpp
@@ -675,21 +675,18 @@ ToplevelList Workspace::xStackingOrder() const
         return x_stacking;
     x_stacking_dirty = false;
     x_stacking.clear();
-    Window dummy;
-    Window* windows = NULL;
-    unsigned int count = 0;
-    XQueryTree(display(), rootWindow(), &dummy, &dummy, &windows, &count);
+    Xcb::Tree tree(rootWindow());
     // use our own stacking order, not the X one, as they may differ
     foreach (Toplevel * c, stacking_order)
     x_stacking.append(c);
+
+    xcb_window_t *windows = tree.children();
     for (unsigned int i = 0;
-            i < count;
+            i < tree->children_len;
             ++i) {
         if (Unmanaged* c = findUnmanaged(WindowMatchPredicate(windows[ i ])))
             x_stacking.append(c);
     }
-    if (windows != NULL)
-        XFree(windows);
     if (m_compositor) {
         const_cast< Workspace* >(this)->m_compositor->checkUnredirect();
     }