Added smart attribute keeping when changing label (#3309)

* Added smart attribute keeping when changing label

* Removed input type check

cvat-core/src/annotations-objects.js

@@ -248,6 +248,18 @@
             this.label = label;
             this.attributes = {};
             this.appendDefaultAttributes(label);
+
+            // Try to keep old attributes if name matches and old value is still valid
+            for (const attribute of redoLabel.attributes) {
+                for (const oldAttribute of undoLabel.attributes) {
+                    if (
+                        attribute.name === oldAttribute.name
+                        && validateAttributeValue(undoAttributes[oldAttribute.id], attribute)
+                    ) {
+                        this.attributes[attribute.id] = undoAttributes[oldAttribute.id];
+                    }
+                }
+            }
             const redoAttributes = { ...this.attributes };
 
             this.history.do(