Convert ETreeModel to an interface.

This commit does a number of things which I could not subdivide into
smaller commits.

* Converts ETreeModel to an interface, implemented by MessageList.

* Drops ETreeMemory and ETreeMemoryCallbacks, which were ETreeModel
  subclasses.  Their functionality is subsumed by MessageList.

* MessageList drops its public ETreeModel pointer, since MessageList
  now implements ETreeModel as an interface.

* Adds message_list_set_expanded_default(), which takes over for
  e_tree_memory_set_expanded_default().

3 files changed, 2 insertions, 61 deletions

diff --git a/doc/reference/evolution-util/evolution-util-docs.sgml b/doc/reference/evolution-util/evolution-util-docs.sgml
index d0e5160d12..155468eeac 100644
--- a/doc/reference/evolution-util/evolution-util-docs.sgml
+++ b/doc/reference/evolution-util/evolution-util-docs.sgml
@@ -145,8 +145,6 @@
     <xi:include href="xml/e-table-utils.xml"/>
     <xi:include href="xml/e-table-without.xml"/>
     <xi:include href="xml/e-tree.xml"/>
-    <xi:include href="xml/e-tree-memory-callbacks.xml"/>
-    <xi:include href="xml/e-tree-memory.xml"/>
     <xi:include href="xml/e-tree-model.xml"/>
     <xi:include href="xml/e-tree-selection-model.xml"/>
     <xi:include href="xml/e-tree-table-adapter.xml"/>
diff --git a/doc/reference/evolution-util/evolution-util-sections.txt b/doc/reference/evolution-util/evolution-util-sections.txt
index 2cb2911ddc..2e8c9d2ee7 100644
--- a/doc/reference/evolution-util/evolution-util-sections.txt
+++ b/doc/reference/evolution-util/evolution-util-sections.txt
@@ -4281,60 +4281,6 @@ ETreePrivate
 </SECTION>
 
 <SECTION>
-<FILE>e-tree-memory</FILE>
-<TITLE>ETreeMemory</TITLE>
-ETreeMemory
-e_tree_memory_node_insert
-e_tree_memory_node_remove
-e_tree_memory_freeze
-e_tree_memory_thaw
-e_tree_memory_set_expanded_default
-e_tree_memory_node_get_data
-e_tree_memory_node_set_data
-<SUBSECTION Standard>
-E_TREE_MEMORY
-E_IS_TREE_MEMORY
-E_TYPE_TREE_MEMORY
-E_TREE_MEMORY_CLASS
-E_IS_TREE_MEMORY_CLASS
-E_TREE_MEMORY_GET_CLASS
-ETreeMemoryClass
-e_tree_memory_get_type
-<SUBSECTION Private>
-ETreeMemoryPrivate
-</SECTION>
-
-<SECTION>
-<FILE>e-tree-memory-callbacks</FILE>
-<TITLE>ETreeMemoryCallbacks</TITLE>
-ETreeMemoryCallbacks
-ETreeMemoryCallbacksIconAtFn
-ETreeMemoryCallbacksColumnCountFn
-ETreeMemoryCallbacksHasSaveIdFn
-ETreeMemoryCallbacksGetSaveIdFn
-ETreeMemoryCallbacksHasGetNodeByIdFn
-ETreeMemoryCallbacksGetNodeByIdFn
-ETreeMemoryCallbacksValueAtFn
-ETreeMemoryCallbacksSetValueAtFn
-ETreeMemoryCallbacksIsEditableFn
-ETreeMemoryCallbacksDuplicateValueFn
-ETreeMemoryCallbacksFreeValueFn
-ETreeMemoryCallbacksInitializeValueFn
-ETreeMemoryCallbacksValueIsEmptyFn
-ETreeMemoryCallbacksValueToStringFn
-e_tree_memory_callbacks_new
-<SUBSECTION Standard>
-E_TREE_MEMORY_CALLBACKS
-E_IS_TREE_MEMORY_CALLBACKS
-E_TYPE_TREE_MEMORY_CALLBACKS
-E_TREE_MEMORY_CALLBACKS_CLASS
-E_IS_TREE_MEMORY_CALLBACKS_CLASS
-E_TREE_MEMORY_CALLBACKS_GET_CLASS
-ETreeMemoryCallbacksClass
-e_tree_memory_callbacks_get_type
-</SECTION>
-
-<SECTION>
 <FILE>e-tree-model</FILE>
 <TITLE>ETreeModel</TITLE>
 ETreeModel
@@ -4377,10 +4323,8 @@ e_tree_model_node_deleted
 E_TREE_MODEL
 E_IS_TREE_MODEL
 E_TYPE_TREE_MODEL
-E_TREE_MODEL_CLASS
-E_IS_TREE_MODEL_CLASS
-E_TREE_MODEL_GET_CLASS
-ETreeModelClass
+E_TREE_MODEL_GET_INTERFACE
+ETreeModelInterface
 e_tree_model_get_type
 </SECTION>
 
diff --git a/doc/reference/evolution-util/evolution-util.types b/doc/reference/evolution-util/evolution-util.types
index 68ed3eb130..bc64175e6d 100644
--- a/doc/reference/evolution-util/evolution-util.types
+++ b/doc/reference/evolution-util/evolution-util.types
@@ -154,7 +154,6 @@ e_text_get_type
 e_text_model_get_type
 e_timezone_dialog_get_type
 e_tree_get_type
-e_tree_memory_get_type
 e_tree_model_generator_get_type
 e_tree_model_get_type
 e_tree_selection_model_get_type