refactor: split out block serialization for creating new blocks from the flyout

core/flyout_base.ts

@@ -1301,8 +1301,8 @@ export abstract class Flyout
     }
 
     // Clone the block.
-    const json = blocks.save(oldBlock) as blocks.State;
-    // Normallly this resizes leading to weird jumps. Save it for terminateDrag.
+    const json = this.serializeBlock(oldBlock);
+    // Normally this resizes leading to weird jumps. Save it for terminateDrag.
     targetWorkspace.setResizesEnabled(false);
     const block = blocks.append(json, targetWorkspace) as BlockSvg;
 
@@ -1311,6 +1311,16 @@ export abstract class Flyout
     return block;
   }
 
+  /**
+   * Serialize a block to JSON.
+   *
+   * @param block The block to serialize.
+   * @returns A serialized representation of the block.
+   */
+  protected serializeBlock(block: BlockSvg): blocks.State {
+    return blocks.save(block) as blocks.State;
+  }
+
   /**
    * Positions a block on the target workspace.
    *