Fix redo issue

cypress/e2e/history.cy.ts

@@ -87,4 +87,39 @@ describe("history", () => {
       ],
     });
   });
+
+  it("should not redo after undo and value change", () => {
+    when.setStyle("geojson");
+    when.modal.open();
+    when.modal.fillLayers({
+      id: "step 1",
+      type: "background",
+    });
+
+    when.modal.open();
+    when.modal.fillLayers({
+      id: "step 2",
+      type: "background",
+    });
+
+    when.typeKeys(undoKeyCombo);
+    when.typeKeys(undoKeyCombo);
+    then(get.styleFromLocalStorage()).shouldDeepNestedInclude({ layers: [] });
+
+    when.modal.open();
+    when.modal.fillLayers({
+      id: "step 3",
+      type: "background",
+    });
+
+    when.typeKeys(redoKeyCombo);
+    then(get.styleFromLocalStorage()).shouldDeepNestedInclude({
+      layers: [
+        {
+          id: "step 3",
+          type: "background",
+        },
+      ],
+    });
+  });
 });

src/libs/revisions.ts

@@ -19,10 +19,13 @@ export class RevisionStore {
   }
 
   addRevision(revision: StyleSpecification & {id: string}) {
-    //TODO: compare new revision style id with old ones
+    // clear any "redo" revisions once a change is made
-    //and ensure that it is always the same id
+    // and ensure current index is at end of list
+    this.revisions = this.revisions.slice(0, this.currentIdx + 1);
+
     this.revisions.push(revision)
     this.currentIdx++
+    //}
   }
 
   undo() {