Add getDragBlock

src/block_manager/index.ts

@@ -315,6 +315,15 @@ export default class BlockManager extends ItemManagerModule<BlockManagerConfig,
     return this.blocksView?.el;
   }
 
+  /**
+   * Returns currently dragging block.
+   * Updated when the drag starts and cleared once it's done.
+   * @returns {[Block]|undefined}
+   */
+  getDragBlock() {
+    return this._dragBlock;
+  }
+
   /**
    * Render blocks
    * @param  {Array} blocks Blocks to render, without the argument will render all global blocks