[gxml: 21/25] GomDocument : Update 'query_selector_all' method

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 98d7ef92e06adc7fe382a4b495efa30fa8a77380
Author: BZHDeveloper <inizan yannick gmail com>
Date:   Sat Mar 16 18:44:29 2019 +0100

    GomDocument : Update 'query_selector_all' method

 gxml/GomDocument.vala | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gxml/GomDocument.vala b/gxml/GomDocument.vala
index 2642aaf..3e2d9ed 100644
--- a/gxml/GomDocument.vala
+++ b/gxml/GomDocument.vala
@@ -356,8 +356,9 @@ public class GXml.GomDocument : GomNode,
     var cs = new CssSelectorParser ();
     cs.parse (selectors);
     var l = new GomNodeList();
-    foreach (DomElement e in children) {
-      if (cs.match (e))
+    foreach (DomNode e in child_nodes) {
+      if (!(e is DomElement)) continue;
+      if (cs.match (e as DomElement))
         l.add (e);
       l.add_all (cs.query_selector_all (e));
     }