fix preserveWhiteSpace on document load

ext/dom/document.c

@@ -26,6 +26,7 @@
 #include "php.h"
 #if HAVE_LIBXML && HAVE_DOM
 #include "php_dom.h"
+#include <libxml/SAX.h>
 
 typedef struct _idsIterator idsIterator;
 struct _idsIterator {
@@ -1270,8 +1271,12 @@ static xmlDocPtr dom_document_parser(zval *id, int mode, char *source TSRMLS_DC)
 
 	ctxt->vctxt.error = php_dom_ctx_error;
 	ctxt->vctxt.warning = php_dom_ctx_error;
+
 	if (ctxt->sax != NULL) {
 		ctxt->sax->error = php_dom_ctx_error;
+		if (ctxt->keepBlanks == 0) {
+			ctxt->sax->ignorableWhitespace = ignorableWhitespace;
+		}
 	}
 
 	xmlParseDocument(ctxt);