Merge pull request #9966 from jahow/allow-disable-canvas-reuse

Document how to circumvent the canvas reuse optimization

src/ol/PluggableMap.js

@@ -587,6 +587,10 @@ class PluggableMap extends BaseObject {
    * Detect layers that have a color value at a pixel on the viewport, and
    * execute a callback with each matching layer. Layers included in the
    * detection can be configured through `opt_layerFilter`.
+   *
+   * Note: this may give false positives unless the map layers have had different `className`
+   * properties assigned to them.
+   *
    * @param {import("./pixel.js").Pixel} pixel Pixel.
    * @param {function(this: S, import("./layer/Layer.js").default, (Uint8ClampedArray|Uint8Array)): T} callback
    *     Layer callback. This callback will receive two arguments: first is the