[evolution-data-server] I#299 - e_xml_is_element_name: Can fail to match a namespaced node

[Milan Crha <mcrha src gnome org>]

commit dfcf247ba26fafd1a3ede323244480ad7251b03d
Author: Milan Crha <mcrha redhat com>
Date:   Thu Feb 11 11:10:27 2021 +0100

    I#299 - e_xml_is_element_name: Can fail to match a namespaced node
    
    When the XML document defines two namespace prefixes for the same
    namespace HREF, the xmlSearchNsByHref() might not necessarily return
    the same namespace structure as the one being set on the 'node',
    which could lead to a failure to match the namespace, even
    the namespace HREF matched.
    
    Closes https://gitlab.gnome.org/GNOME/evolution-data-server/-/issues/299

 src/libedataserver/e-xml-utils.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/src/libedataserver/e-xml-utils.c b/src/libedataserver/e-xml-utils.c
index 10bfcef99..a80fb1b48 100644
--- a/src/libedataserver/e-xml-utils.c
+++ b/src/libedataserver/e-xml-utils.c
@@ -494,7 +494,12 @@ e_xml_is_element_name (xmlNode *node,
                        if (!node->ns)
                                return TRUE;
                } else if (node->ns) {
-                       xmlNsPtr nsPtr = xmlSearchNsByHref (node->doc, node, (const xmlChar *) ns_href);
+                       xmlNsPtr nsPtr;
+
+                       if (g_strcmp0 ((const gchar *) node->ns->href, ns_href) == 0)
+                               return TRUE;
+
+                       nsPtr = xmlSearchNsByHref (node->doc, node, (const xmlChar *) ns_href);
 
                        if (nsPtr && node->ns == nsPtr)
                                return TRUE;