Fix: undo and redo state management

src/components/DockBuilder/DockBuilder.jsx

@@ -609,26 +609,45 @@ export const DockBuilder = () => {
 
   const onUndoClick = useCallback(() => {
     const undoResult = stack.undo();
-    if (undoResult && undoResult.currentState) {
-      editorMemo.loadFromJSON(undoResult.currentState, () => {
-        editorMemo.renderAll();
+    if (undoResult.currentCount === -1) {
+      return 0;
+    }
+    if (undoResult.currentCount === 0) {
+      editorMemo.getObjects().forEach((obj) => {
+        if (obj !== editorMemo.backgroundImage) {
+          if (obj.type == "image") {
+            editorMemo.remove(obj).renderAll();
+          }
+        }
+        const data = editorMemo.toJSON(["dockData"]);
+        localStorage.setItem("dock", JSON.stringify(data));
       });
+    } else if (undoResult.currentCount > 0) {
+      const json = JSON.parse(undoResult.currentState);
+      editorMemo.loadFromJSON(
+        json,
+        () => {
+          editorMemo.renderAll();
+        },
+        (obj) => {}
+      );
     }
   }, [editorMemo]);
 
   const onRedoClick = useCallback(() => {
     const redoResult = stack.redo();
-    if (redoResult && redoResult.currentState) {
-      // currentState is an array, get the first element
-      const state = Array.isArray(redoResult.currentState)
-        ? redoResult.currentState[0]
-        : redoResult.currentState;
-      if (state) {
-        editorMemo.loadFromJSON(state, () => {
+    if (!redoResult.currentState) {
+      return 0;
+    }
+
+    localStorage.setItem("dock", redoResult.currentState);
+    editorMemo.loadFromJSON(
+      JSON.parse(redoResult.currentState),
+      () => {
         editorMemo.renderAll();
-        });
-      }
-    }
+      },
+      (o) => {}
+    );
   }, [editorMemo]);
 
   const onPrintScreen = useCallback(() => {