Pass null as forEachFeatureAtPixel layer arg for unmanaged layers

src/ol/interaction/selectinteraction.js

@@ -97,6 +97,8 @@ goog.inherits(ol.interaction.SelectEvent, goog.events.Event);
  * `toggle`, `add`/`remove`, and `multi` options; a `layers` filter; and a
  * further feature filter using the `filter` option.
  *
+ * Selected features are added to an internal unmanaged layer.
+ *
  * @constructor
  * @extends {ol.interaction.Interaction}
  * @param {olx.interaction.SelectOptions=} opt_options Options.

src/ol/layer/layer.js

@@ -20,6 +20,11 @@ goog.require('ol.source.State');
  * Layers group together those properties that pertain to how the data is to be
  * displayed, irrespective of the source of that data.
  *
+ * Layers are usually added to a map with {@link ol.Map#addLayer}. Components
+ * like {@link ol.interaction.Select} use unmanaged layers internally. These
+ * unmanaged layers are associated with the map using
+ * {@link ol.layer.Layer#setMap} instead.
+ *
  * A generic `change` event is fired when the state of the source changes.
  *
  * @constructor

src/ol/map.js

@@ -599,8 +599,9 @@ ol.Map.prototype.disposeInternal = function() {
  *     called with two arguments. The first argument is one
  *     {@link ol.Feature feature} or
  *     {@link ol.render.Feature render feature} at the pixel, the second is
- *     the {@link ol.layer.Layer layer} of the feature. To stop detection,
- *     callback functions can return a truthy value.
+ *     the {@link ol.layer.Layer layer} of the feature and will be null for
+ *     unmanaged layers. To stop detection, callback functions can return a
+ *     truthy value.
  * @param {S=} opt_this Value to use as `this` when executing `callback`.
  * @param {(function(this: U, ol.layer.Layer): boolean)=} opt_layerFilter Layer
  *     filter function. The filter function will receive one argument, the

src/ol/renderer/maprenderer.js

@@ -174,7 +174,9 @@ ol.renderer.Map.prototype.forEachFeatureAtCoordinate =
       if (layer.getSource()) {
         result = layerRenderer.forEachFeatureAtCoordinate(
             layer.getSource().getWrapX() ? translatedCoordinate : coordinate,
-            frameState, callback, thisArg);
+            frameState,
+            layerState.managed ? callback : forEachFeatureAtCoordinate,
+            thisArg);
       }
       if (result) {
         return result;