msxml3: Store information about ignorrable whitespace nodes in xmlNode._private variable.

dlls/msxml3/domdoc.c

@@ -448,8 +448,15 @@ static void sax_characters(void *ctx, const xmlChar *ch, int len)
             (!ctxt->node->last ||
             ((ctxt->node->last && (cur == '<' || ctxt->node->last->type != XML_TEXT_NODE))
            )))
+        {
+            /* Keep information about ignorable whitespace text node in previous or parent node */
+            if (ctxt->node->last)
+                *(DWORD*)&ctxt->node->last->_private |= NODE_PRIV_TRAILING_IGNORABLE_WS;
+            else if (ctxt->node->type != XML_DOCUMENT_NODE)
+                *(DWORD*)&ctxt->node->_private |= NODE_PRIV_CHILD_IGNORABLE_WS;
             return;
         }
+    }
 
     xmlSAX2Characters(ctxt, ch, len);
 }

dlls/msxml3/msxml_private.h

@@ -559,4 +559,7 @@ HRESULT detach_bsc(bsc_t*) DECLSPEC_HIDDEN;
 /* ... */
 #define E_XML_REQUIRED_ATTRIBUTE_MISSING    0xC00CE020
 
+#define NODE_PRIV_TRAILING_IGNORABLE_WS     0x40000000
+#define NODE_PRIV_CHILD_IGNORABLE_WS        0x80000000
+#define NODE_PRIV_REFCOUNT_MASK             ~(NODE_PRIV_TRAILING_IGNORABLE_WS|NODE_PRIV_CHILD_IGNORABLE_WS)
 #endif /* __MSXML_PRIVATE__ */

dlls/msxml3/node.c

@@ -398,7 +398,7 @@ HRESULT node_get_next_sibling(xmlnode *This, IXMLDOMNode **ret)
 
 static int node_get_inst_cnt(xmlNodePtr node)
 {
-    int ret = *(LONG *)&node->_private;
+    int ret = *(LONG *)&node->_private & NODE_PRIV_REFCOUNT_MASK;
     xmlNodePtr child;
 
     /* add attribute counts */
@@ -429,7 +429,8 @@ int xmlnode_get_inst_cnt(xmlnode *node)
     return node_get_inst_cnt(node->node);
 }
 
-/* _private field holds a number of COM instances spawned from this libxml2 node */
+/* _private field holds a number of COM instances spawned from this libxml2 node
+ * most significant bits are used to store information about ignorrable whitespace nodes */
 static void xmlnode_add_ref(xmlNodePtr node)
 {
     if (node->type == XML_DOCUMENT_NODE) return;