Revert "tests/test_xpath_selector_unit/feat: Do forest_transplanting by default"

This reverts commit 4d266cac9f.

changedetectionio/html_tools.py

@@ -125,13 +125,25 @@ def forest_transplanting(root):
     root_siblings_preceding = [ s for s in root.itersiblings(preceding=True)]
     root_siblings = [s for s in root.itersiblings()]
 
-    new_root = etree.Element("new_root")
+    Is_fragment=False
+    # If element node exsits in root element node's sibilings, it is fragment.
+    for node in chain(root_siblings_preceding, root_siblings):
+        if not hasattr(node.tag, '__name__'):
+            Is_fragment=True
+            # early exit. because the root is already root element.
+            # So, two root element nodes are detected. DOM violation.
+            break
 
+    if Is_fragment:
+        new_root = etree.Element("new_root")
         root_siblings_preceding.reverse()
         for node in chain(root_siblings_preceding, [root], root_siblings):
             new_root.append(node)
         return new_root, True
 
+    return root, False
+
+
 # Return str Utf-8 of matched rules
 def xpath_filter(xpath_filter, html_content, append_pretty_line_formatting=False, is_rss=False):
     from lxml import etree, html