Copy collection columns wherever we construct new DCEs

lib/galaxy/model/__init__.py

@@ -8162,6 +8162,7 @@ class DatasetCollectionElement(Base, Dictifiable, Serializable):
             collection=collection,
             element_index=self.element_index,
             element_identifier=self.element_identifier,
+            columns=self.columns,
         )
         return new_element
 

lib/galaxy/model/deferred.py

@@ -372,6 +372,7 @@ def _materialize_collection_element(
         element=materialized_object,
         element_index=element.element_index,
         element_identifier=element.element_identifier,
+        columns=element.columns,
     )
     return materialized_element
 

lib/galaxy/model/dereference.py

@@ -105,6 +105,7 @@ def derefence_collection_element(
         element=child_dataset_collection,
         element_identifier=element.identifier,
         element_index=element_index,
+        columns=element.columns,
     )
     sa_session.add(child_dataset_collection)
     for index, child_element in enumerate(element.elements):
@@ -135,6 +136,7 @@ def dereference_collection_dataset_element(
         element=hda,
         element_identifier=element.identifier,
         element_index=element_index,
+        columns=element.columns,
     )
     parent_dataset_collection.elements.append(dce)