diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.5)
 
-set(PIM_VERSION "5.14.40")
+set(PIM_VERSION "5.14.41")
 project(Akonadi-Calendar  VERSION ${PIM_VERSION})
 
 # ECM setup
diff --git a/src/incidencechanger.h b/src/incidencechanger.h
--- a/src/incidencechanger.h
+++ b/src/incidencechanger.h
@@ -31,6 +31,7 @@
 #include <QWidget>
 
 namespace Akonadi {
+class EntityTreeModel;
 /**
  * @short IncidenceChanger is the preferred way to easily create, modify and delete incidences.
  *
@@ -241,6 +242,17 @@
       */
     void endAtomicOperation();
 
+    /**
+     * Sets the base ETM tree model
+     * Used by the editor dialog's collection combobox, for instance.
+     */
+    void setEntityTreeModel(Akonadi::EntityTreeModel *model);
+
+    /**
+     * Returns the base ETM tree model
+     */
+    Akonadi::EntityTreeModel *entityTreeModel() const;
+
     /**
       * Sets the default collection.
       * @param collection The collection to be used in createIncidence() if the
diff --git a/src/incidencechanger.cpp b/src/incidencechanger.cpp
--- a/src/incidencechanger.cpp
+++ b/src/incidencechanger.cpp
@@ -1128,6 +1128,16 @@
     return d->mDestinationPolicy;
 }
 
+void IncidenceChanger::setEntityTreeModel(Akonadi::EntityTreeModel *entityTreeModel)
+{
+    d->mEntityTreeModel = entityTreeModel;
+}
+
+Akonadi::EntityTreeModel *IncidenceChanger::entityTreeModel() const
+{
+    return d->mEntityTreeModel;
+}
+
 void IncidenceChanger::setDefaultCollection(const Akonadi::Collection &collection)
 {
     d->mDefaultCollection = collection;
diff --git a/src/incidencechanger_p.h b/src/incidencechanger_p.h
--- a/src/incidencechanger_p.h
+++ b/src/incidencechanger_p.h
@@ -314,6 +314,7 @@
     QHash<const KJob *, Change::Ptr> mChangeForJob;
     bool mShowDialogsOnError = false;
     Akonadi::Collection mDefaultCollection;
+    Akonadi::EntityTreeModel *mEntityTreeModel = nullptr;
     DestinationPolicy mDestinationPolicy;
     QVector<Akonadi::Item::Id> mDeletedItemIds;
     Change::List mPendingCreations; // Creations waiting for collections to be loaded