fix: use minimap methods in CanvasDrawer

Author: aminya

lib/minimap-element.js

@@ -673,6 +673,8 @@ class MinimapElement {
    */
   setModel (minimap) {
     this.minimap = minimap
+    // TODO: go direct
+    this.CanvasDrawer.minimap = minimap
 
     this.subscriptions.add(
 

lib/mixins/canvas-drawer.js

@@ -18,6 +18,10 @@ let thisSpec
  * methods  are available on any `MinimapElement` instance.
  */
 export default class CanvasDrawer {
+  constructor() {
+    // set in setModel of minimapElement
+    this.minimap = undefined
+  }
   /**
    * Initializes the canvas elements needed to perform the `Minimap` rendering.
    */