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ahuber pushed a commit to branch 3172-select2
in repository https://gitbox.apache.org/repos/asf/isis.git

commit b76709ea43c5753aa16d7fad6bd5f1576efae4c7
Author: Andi Huber <[email protected]>
AuthorDate: Thu Aug 25 17:00:23 2022 +0200

    ISIS-3172: purge EmptyChoiceProvider
---
 .../scalars/ScalarPanelSelectAbstract.java         | 20 +++------
 .../scalars/reference/ReferencePanel.java          |  5 +--
 .../valuechoices/ValueChoicesSelect2Panel.java     |  9 +---
 .../ui/components/widgets/select2/ChoiceExt.java   | 40 -----------------
 .../ui/components/widgets/select2/Select2.java     | 52 +++++++++++++++-------
 .../widgets/select2/Select2ChoiceExt.java          | 15 ++++---
 .../widgets/select2/Select2MultiChoiceExt.java     | 16 ++++---
 .../select2/providers/ChoiceProviderAbstract.java  | 33 +++++++-------
 .../select2/providers/ChoiceProviderForValues.java |  1 +
 9 files changed, 80 insertions(+), 111 deletions(-)

diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/ScalarPanelSelectAbstract.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/ScalarPanelSelectAbstract.java
index dd4b55b5c1..8d299e394e 100644
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/ScalarPanelSelectAbstract.java
+++ 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/ScalarPanelSelectAbstract.java
@@ -22,15 +22,13 @@ import java.util.Optional;
 
 import org.apache.wicket.ajax.AjaxRequestTarget;
 import org.apache.wicket.markup.html.WebMarkupContainer;
-import org.apache.wicket.model.Model;
 import org.springframework.lang.Nullable;
-import org.wicketstuff.select2.ChoiceProvider;
 
-import org.apache.isis.core.metamodel.objectmanager.memento.ObjectMemento;
 import org.apache.isis.core.metamodel.spec.ManagedObject;
 import org.apache.isis.viewer.commons.model.feature.ParameterUiModel;
 import org.apache.isis.viewer.wicket.model.models.ScalarModel;
 import org.apache.isis.viewer.wicket.ui.components.widgets.select2.Select2;
+import 
org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ChoiceProviderAbstract;
 import org.apache.isis.viewer.wicket.ui.util.Wkt;
 import org.apache.isis.viewer.wicket.ui.util.Wkt.EventTopic;
 
@@ -43,8 +41,7 @@ extends ScalarPanelFormFieldAbstract<ManagedObject> {
 
     private static final long serialVersionUID = 1L;
 
-    @Getter
-    protected Select2 select2;
+    @Getter protected Select2 select2;
 
     public ScalarPanelSelectAbstract(final String id, final ScalarModel 
scalarModel) {
         super(id, scalarModel, ManagedObject.class);
@@ -52,20 +49,13 @@ extends ScalarPanelFormFieldAbstract<ManagedObject> {
     }
 
     protected final Select2 createSelect2(final String id) {
-        val scalarModel = scalarModel();
-
-        val select2 = Select2.createSelect2(id, scalarModel());
-        select2.setLabel(Model.of(scalarModel.getFriendlyName()));
-        select2.getSettings().setWidth("100%");
-
-        updateChoices(select2);
-        return select2;
+        return Select2.createSelect2(id, scalarModel(), buildChoiceProvider());
     }
 
     /**
      * Mandatory hook (is called by {@link #createSelect2(String)})
      */
-    protected abstract ChoiceProvider<ObjectMemento> buildChoiceProvider();
+    protected abstract ChoiceProviderAbstract buildChoiceProvider();
 
     // //////////////////////////////////////
 
@@ -110,7 +100,7 @@ extends ScalarPanelFormFieldAbstract<ManagedObject> {
         if (select2 == null) {
             return false;
         }
-        select2.setProvider(buildChoiceProvider());
+        select2.rebuildChoiceProvider();
         return true;
     }
 
diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/reference/ReferencePanel.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/reference/ReferencePanel.java
index 0585c1a53c..dfef28f3a5 100644
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/reference/ReferencePanel.java
+++ 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/reference/ReferencePanel.java
@@ -28,11 +28,9 @@ import org.apache.wicket.markup.html.form.FormComponent;
 import org.apache.wicket.model.Model;
 import org.apache.wicket.util.convert.ConversionException;
 import org.apache.wicket.util.convert.IConverter;
-import org.wicketstuff.select2.ChoiceProvider;
 import org.wicketstuff.select2.Settings;
 
 import 
org.apache.isis.applib.services.placeholder.PlaceholderRenderService.PlaceholderLiteral;
-import org.apache.isis.core.metamodel.objectmanager.memento.ObjectMemento;
 import org.apache.isis.core.metamodel.spec.ManagedObject;
 import org.apache.isis.core.metamodel.util.Facets;
 import org.apache.isis.viewer.commons.model.StringForRendering;
@@ -45,6 +43,7 @@ import 
org.apache.isis.viewer.wicket.ui.components.scalars.ScalarPanelAbstract;
 import 
org.apache.isis.viewer.wicket.ui.components.scalars.ScalarPanelSelectAbstract;
 import 
org.apache.isis.viewer.wicket.ui.components.widgets.entitysimplelink.EntityLinkSimplePanel;
 import org.apache.isis.viewer.wicket.ui.components.widgets.select2.Select2;
+import 
org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ChoiceProviderAbstract;
 import 
org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ChoiceProviderForReferences;
 import org.apache.isis.viewer.wicket.ui.util.Wkt;
 import org.apache.isis.viewer.wicket.ui.util.Wkt.EventTopic;
@@ -255,7 +254,7 @@ public class ReferencePanel extends 
ScalarPanelSelectAbstract {
     }
 
     @Override
-    protected ChoiceProvider<ObjectMemento> buildChoiceProvider() {
+    protected ChoiceProviderAbstract buildChoiceProvider() {
         return new ChoiceProviderForReferences(scalarModel());
     }
 
diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/valuechoices/ValueChoicesSelect2Panel.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/valuechoices/ValueChoicesSelect2Panel.java
index e643170047..31923826b5 100644
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/valuechoices/ValueChoicesSelect2Panel.java
+++ 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/scalars/valuechoices/ValueChoicesSelect2Panel.java
@@ -23,15 +23,14 @@ import java.util.Optional;
 import org.apache.wicket.Component;
 import org.apache.wicket.ajax.AjaxRequestTarget;
 import org.apache.wicket.markup.html.form.FormComponent;
-import org.wicketstuff.select2.ChoiceProvider;
 
 import org.apache.isis.commons.internal.base._Strings;
-import org.apache.isis.core.metamodel.objectmanager.memento.ObjectMemento;
 import org.apache.isis.core.metamodel.spec.ManagedObject;
 import org.apache.isis.viewer.commons.model.StringForRendering;
 import org.apache.isis.viewer.wicket.model.models.ScalarModel;
 import 
org.apache.isis.viewer.wicket.ui.components.scalars.ScalarFragmentFactory.InputFragment;
 import 
org.apache.isis.viewer.wicket.ui.components.scalars.ScalarPanelSelectAbstract;
+import 
org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ChoiceProviderAbstract;
 import 
org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ChoiceProviderForValues;
 import org.apache.isis.viewer.wicket.ui.util.Wkt;
 import org.apache.isis.viewer.wicket.ui.util.WktTooltips;
@@ -139,13 +138,9 @@ extends ScalarPanelSelectAbstract {
 
     // --
 
-    // in corresponding code in ReferencePanelFactory, these is a branch for 
different types of providers
-    // (choice vs autoComplete).  Here though - because values don't currently 
support autoComplete - no branch is required
     @Override
-    protected ChoiceProvider<ObjectMemento> buildChoiceProvider() {
+    protected ChoiceProviderAbstract buildChoiceProvider() {
         return new ChoiceProviderForValues(scalarModel());
     }
 
-
-
 }
diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/ChoiceExt.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/ChoiceExt.java
deleted file mode 100644
index 5a205a4310..0000000000
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/ChoiceExt.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- *  Licensed to the Apache Software Foundation (ASF) under one
- *  or more contributor license agreements.  See the NOTICE file
- *  distributed with this work for additional information
- *  regarding copyright ownership.  The ASF licenses this file
- *  to you under the Apache License, Version 2.0 (the
- *  "License"); you may not use this file except in compliance
- *  with the License.  You may obtain a copy of the License at
- *
- *        http://www.apache.org/licenses/LICENSE-2.0
- *
- *  Unless required by applicable law or agreed to in writing,
- *  software distributed under the License is distributed on an
- *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- *  KIND, either express or implied.  See the License for the
- *  specific language governing permissions and limitations
- *  under the License.
- */
-package org.apache.isis.viewer.wicket.ui.components.widgets.select2;
-
-import org.wicketstuff.select2.ChoiceProvider;
-import org.wicketstuff.select2.Select2Choice;
-import org.wicketstuff.select2.Select2MultiChoice;
-import org.wicketstuff.select2.Settings;
-
-import org.apache.isis.applib.id.HasLogicalType;
-import org.apache.isis.core.metamodel.objectmanager.memento.ObjectMemento;
-
-/**
- * Represents functionality that is common to both {@link Select2Choice} and 
{@link Select2MultiChoice}, but for
- * which there is no suitable common supertype.
- *
- */
-public interface ChoiceExt extends HasLogicalType {
-
-    void setProvider(final ChoiceProvider<ObjectMemento> providerForChoices);
-    Settings getSettings();
-
-
-}
diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2.java
index ca3b361961..d3ca92a044 100644
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2.java
+++ 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2.java
@@ -30,7 +30,6 @@ import org.wicketstuff.select2.AbstractSelect2Choice;
 import org.wicketstuff.select2.ChoiceProvider;
 import org.wicketstuff.select2.Select2Choice;
 import org.wicketstuff.select2.Select2MultiChoice;
-import org.wicketstuff.select2.Settings;
 
 import org.apache.isis.commons.functional.Either;
 import org.apache.isis.core.metamodel.objectmanager.memento.ObjectMemento;
@@ -41,8 +40,10 @@ import 
org.apache.isis.viewer.wicket.model.models.ScalarModel;
 import org.apache.isis.viewer.wicket.model.models.ScalarModelWithMultiChoice;
 import org.apache.isis.viewer.wicket.model.models.ScalarModelWithSingleChoice;
 import org.apache.isis.viewer.wicket.model.util.WktContext;
+import 
org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ChoiceProviderAbstactForScalarModel;
 
 import lombok.NonNull;
+import lombok.SneakyThrows;
 import lombok.val;
 
 /**
@@ -57,14 +58,26 @@ implements
 
     final Either<Select2ChoiceExt, Select2MultiChoiceExt> select2Choice;
 
-    public static Select2 createSelect2(final String id, final ScalarModel 
scalarModel) {
-        return new Select2(!scalarModel.isCollection()
+    public static Select2 createSelect2(
+            final String id,
+            final ScalarModel scalarModel,
+            final ChoiceProvider<ObjectMemento> choiceProvider) {
+        val select2 = new Select2(scalarModel.isScalar()
                 ? Either.left(
                         Select2ChoiceExt.create(id,
-                                
ScalarModelWithSingleChoice.chain(scalarModel), scalarModel))
+                                ScalarModelWithSingleChoice.chain(scalarModel),
+                                scalarModel,
+                                choiceProvider))
                 : Either.right(
                         Select2MultiChoiceExt.create(id,
-                                ScalarModelWithMultiChoice.chain(scalarModel), 
scalarModel)));
+                                ScalarModelWithMultiChoice.chain(scalarModel),
+                                scalarModel,
+                                choiceProvider)));
+
+        select2.setLabel(Model.of(scalarModel.getFriendlyName()));
+        select2.getSettings().setWidth("100%");
+
+        return select2;
     }
 
     private Select2(final @NonNull Either<Select2ChoiceExt, 
Select2MultiChoiceExt> select2Choice) {
@@ -72,17 +85,28 @@ implements
         asComponent().setOutputMarkupId(true);
     }
 
-    public void setProvider(final ChoiceProvider<ObjectMemento> 
providerForChoices) {
-        asChoiceExt().setProvider(providerForChoices);
+    public org.wicketstuff.select2.Settings getSettings() {
+        return select2Choice.fold(
+                Select2ChoiceExt::getSettings,
+                Select2MultiChoiceExt::getSettings);
     }
 
-    public AbstractSelect2Choice<ObjectMemento, ?> asComponent() {
-        return select2Choice.fold(
-                single->single,
-                multi->multi);
+    // not sure if required any more
+    @SneakyThrows
+    public void rebuildChoiceProvider() {
+        val oldProvider = (ChoiceProviderAbstactForScalarModel)
+                select2Choice.fold(
+                        Select2ChoiceExt::getProvider,
+                        Select2MultiChoiceExt::getProvider);
+        val scalarModel = oldProvider.scalarModel();
+        val constr = oldProvider.getClass().getConstructor(ScalarModel.class);
+        val newProvider = constr.newInstance(scalarModel);
+        select2Choice.accept(
+                single->single.setProvider(newProvider),
+                multi->multi.setProvider(newProvider));
     }
 
-    public ChoiceExt asChoiceExt() {
+    public AbstractSelect2Choice<ObjectMemento, ?> asComponent() {
         return select2Choice.fold(
                 single->single,
                 multi->multi);
@@ -105,10 +129,6 @@ implements
         return asComponent().checkRequired();
     }
 
-    public Settings getSettings() {
-        return asChoiceExt().getSettings();
-    }
-
     public ManagedObject getConvertedInputValue() {
         return getCommonContext().reconstructObject(convertedInput());
     }
diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2ChoiceExt.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2ChoiceExt.java
index 937522b358..9e68a73c64 100644
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2ChoiceExt.java
+++ 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2ChoiceExt.java
@@ -19,26 +19,28 @@
 package org.apache.isis.viewer.wicket.ui.components.widgets.select2;
 
 import org.apache.wicket.model.IModel;
+import org.wicketstuff.select2.ChoiceProvider;
 import org.wicketstuff.select2.Select2Choice;
 
+import org.apache.isis.applib.id.HasLogicalType;
 import org.apache.isis.applib.id.LogicalType;
 import org.apache.isis.core.metamodel.objectmanager.memento.ObjectMemento;
 import org.apache.isis.viewer.wicket.model.models.ScalarModel;
-import 
org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ChoiceProviderAbstract;
 
 import lombok.Getter;
 
 public class Select2ChoiceExt
 extends Select2Choice<ObjectMemento>
-implements ChoiceExt {
+implements HasLogicalType {
 
     private static final long serialVersionUID = 1L;
 
     public static Select2ChoiceExt create(
             final String id,
             final IModel<ObjectMemento> modelObject,
-            final ScalarModel scalarModel) {
-        return new Select2ChoiceExt(id, modelObject, scalarModel);
+            final ScalarModel scalarModel,
+            final ChoiceProvider<ObjectMemento> choiceProvider) {
+        return new Select2ChoiceExt(id, modelObject, scalarModel, 
choiceProvider);
     }
 
     @Getter(onMethod_ = {@Override}) private final LogicalType logicalType;
@@ -46,8 +48,9 @@ implements ChoiceExt {
     private Select2ChoiceExt(
             final String id,
             final IModel<ObjectMemento> model,
-            final ScalarModel scalarModel) {
-        super(id, model, ChoiceProviderAbstract.empty());
+            final ScalarModel scalarModel,
+            final ChoiceProvider<ObjectMemento> choiceProvider) {
+        super(id, model, choiceProvider);
         logicalType = scalarModel.getScalarTypeSpec().getLogicalType();
 
         getSettings().setCloseOnSelect(true);
diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2MultiChoiceExt.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2MultiChoiceExt.java
index 99de1721ff..0db0214c09 100644
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2MultiChoiceExt.java
+++ 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/Select2MultiChoiceExt.java
@@ -22,30 +22,31 @@ import java.util.ArrayList;
 import java.util.Collection;
 
 import org.apache.wicket.model.IModel;
+import org.wicketstuff.select2.ChoiceProvider;
 import org.wicketstuff.select2.Select2MultiChoice;
 
+import org.apache.isis.applib.id.HasLogicalType;
 import org.apache.isis.applib.id.LogicalType;
 import org.apache.isis.commons.internal.base._Casts;
 import org.apache.isis.core.metamodel.objectmanager.memento.ObjectMemento;
 import org.apache.isis.viewer.wicket.model.models.ScalarModel;
-import 
org.apache.isis.viewer.wicket.ui.components.widgets.select2.providers.ChoiceProviderAbstract;
 
 import lombok.Getter;
 import lombok.val;
 
 public class Select2MultiChoiceExt
 extends Select2MultiChoice<ObjectMemento>
-implements
-    ChoiceExt {
+implements HasLogicalType {
 
     private static final long serialVersionUID = 1L;
 
     public static Select2MultiChoiceExt create(
             final String id,
             final IModel<ArrayList<ObjectMemento>> modelObject,
-            final ScalarModel scalarModel) {
+            final ScalarModel scalarModel,
+            final ChoiceProvider<ObjectMemento> choiceProvider) {
 
-        return new Select2MultiChoiceExt(id, 
_Casts.uncheckedCast(modelObject), scalarModel);
+        return new Select2MultiChoiceExt(id, 
_Casts.uncheckedCast(modelObject), scalarModel, choiceProvider);
     }
 
     @Getter(onMethod_ = {@Override}) private final LogicalType logicalType;
@@ -53,9 +54,10 @@ implements
     Select2MultiChoiceExt(
             final String id,
             final IModel<Collection<ObjectMemento>> model,
-            final ScalarModel scalarModel) {
+            final ScalarModel scalarModel,
+            final ChoiceProvider<ObjectMemento> choiceProvider) {
 
-        super(id, model, ChoiceProviderAbstract.empty());
+        super(id, model, choiceProvider);
         logicalType = scalarModel.getScalarTypeSpec().getLogicalType();
 
         getSettings().setCloseOnSelect(true);
diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/providers/ChoiceProviderAbstract.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/providers/ChoiceProviderAbstract.java
index 1b485d2b3b..9bd65751a7 100644
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/providers/ChoiceProviderAbstract.java
+++ 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/providers/ChoiceProviderAbstract.java
@@ -24,7 +24,6 @@ import java.util.stream.Collectors;
 import org.apache.wicket.util.string.Strings;
 import org.springframework.lang.Nullable;
 import org.wicketstuff.select2.ChoiceProvider;
-import org.wicketstuff.select2.Response;
 
 import org.apache.isis.applib.services.i18n.TranslationContext;
 import org.apache.isis.applib.services.placeholder.PlaceholderRenderService;
@@ -46,22 +45,22 @@ implements HasCommonContext {
 
     // -- EMPTY CHOICE PROVIDER
 
-    public static class EmptyChoiceProvider extends 
ChoiceProvider<ObjectMemento> {
-        private static final long serialVersionUID = 1L;
-        @Override public String getDisplayValue(final ObjectMemento object) {
-            return null; }
-        @Override public String getIdValue(final ObjectMemento object) {
-            return null; }
-        @Override public void query(
-                final String term, final int page, final 
Response<ObjectMemento> response) {}
-        @Override public Collection<ObjectMemento> toChoices(final 
Collection<String> ids) {
-            return null;}
-    }
-    private static final EmptyChoiceProvider EMPTY = new EmptyChoiceProvider();
-
-    public static EmptyChoiceProvider empty() {
-        return EMPTY;
-    }
+//    public static class EmptyChoiceProvider extends 
ChoiceProvider<ObjectMemento> {
+//        private static final long serialVersionUID = 1L;
+//        @Override public String getDisplayValue(final ObjectMemento object) {
+//            return null; }
+//        @Override public String getIdValue(final ObjectMemento object) {
+//            return null; }
+//        @Override public void query(
+//                final String term, final int page, final 
Response<ObjectMemento> response) {}
+//        @Override public Collection<ObjectMemento> toChoices(final 
Collection<String> ids) {
+//            return null;}
+//    }
+//    private static final EmptyChoiceProvider EMPTY = new 
EmptyChoiceProvider();
+//
+//    public static EmptyChoiceProvider empty() {
+//        return EMPTY;
+//    }
 
     // --
 
diff --git 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/providers/ChoiceProviderForValues.java
 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/providers/ChoiceProviderForValues.java
index b0dc468a1b..da950f1360 100644
--- 
a/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/providers/ChoiceProviderForValues.java
+++ 
b/viewers/wicket/ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/select2/providers/ChoiceProviderForValues.java
@@ -26,6 +26,7 @@ import org.apache.isis.viewer.wicket.model.models.ScalarModel;
 
 import lombok.val;
 
+// values don't currently support autoComplete - no branch is required
 public class ChoiceProviderForValues
 extends ChoiceProviderAbstactForScalarModel {
 

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