Update version to 4.20.0 (#4831)

* Update package.json

* Update Image360History.ts

* Update Image360History.ts

viewer/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@cognite/reveal",
-  "version": "4.19.1",
+  "version": "4.20.0",
   "description": "WebGL based 3D viewer for CAD and point clouds processed in Cognite Data Fusion.",
   "homepage": "https://github.com/cognitedata/reveal/tree/master/viewer",
   "repository": {
@@ -15,7 +15,8 @@
     "Håkon Flatval <[email protected]>",
     "Savelii Novikov <[email protected]>",
     "Pramod S <[email protected]>",
-    "Astrid Kløve-Graue <[email protected]>"
+    "Astrid Kløve-Graue <[email protected]>",
+    "Nils Petter Fremming <[email protected]>"
   ],
   "sideEffects": false,
   "main": "dist/index.js",

viewer/packages/360-images/src/Image360History.ts

@@ -6,31 +6,34 @@ import { Image360 } from './entity/Image360';
 import { Image360Action } from './Image360Action';
 
 export class Image360History {
-  private readonly _history: Image360[] = [];
+  private readonly _images: Image360[] = [];
   private _currentIndex: number = -1; // Negative mean no current index (avoid empty because of harder logic)
 
-  public start(history: Image360): void {
+  public start(image: Image360): void {
     if (this.isLegalIndex(this._currentIndex + 1)) {
-      this._history.slice(this._currentIndex + 1);
+      this._images.slice(this._currentIndex + 1);
     }
-    this._history.push(history);
-    this._currentIndex = this._history.length - 1;
+    if (this.current() === image) {
+      return; // No need to add the same image twice to the end
+    }
+    this._images.push(image);
+    this._currentIndex = this._images.length - 1;
   }
 
   private current(): Image360 | undefined {
     if (!this.isLegalIndex(this._currentIndex)) {
       return undefined;
     }
-    return this._history[this._currentIndex];
+    return this._images[this._currentIndex];
   }
 
   public clear(): void {
-    this._history.splice(0, this._history.length);
+    this._images.splice(0, this._images.length);
     this._currentIndex = -1;
   }
 
   private isLegalIndex(index: number): boolean {
-    return index >= 0 && index < this._history.length;
+    return index >= 0 && index < this._images.length;
   }
 
   public canDoAction(action: Image360Action): boolean {