feat: Add an option to copy subsequent blocks when getting copy data from a block.

core/block_svg.ts

@@ -951,17 +951,20 @@ export class BlockSvg
   /**
    * Encode a block for copying.
    *
+   * @param addNextBlocks If true, copy subsequent blocks attached to this one
+   *     as well.
+   *
    * @returns Copy metadata, or null if the block is an insertion marker.
    */
-  toCopyData(): BlockCopyData | null {
+  toCopyData(addNextBlocks = false): BlockCopyData | null {
     if (this.isInsertionMarker_) {
       return null;
     }
     return {
       paster: BlockPaster.TYPE,
       blockState: blocks.save(this, {
         addCoordinates: true,
-        addNextBlocks: false,
+        addNextBlocks,
         saveIds: false,
       }) as blocks.State,
       typeCounts: common.getBlockTypeCounts(this, true),

tests/mocha/clipboard_test.js

@@ -61,6 +61,31 @@ suite('Clipboard', function () {
       );
     });
 
+    test('pasting blocks includes next blocks if requested', function () {
+      const block = Blockly.serialization.blocks.append(
+        {
+          'type': 'controls_if',
+          'id': 'blockId',
+          'next': {
+            'block': {
+              'type': 'controls_if',
+              'id': 'blockId2',
+            },
+          },
+        },
+        this.workspace,
+      );
+      assert.equal(this.workspace.getBlocksByType('controls_if').length, 2);
+      // Both blocks should be copied
+      const data = block.toCopyData(true);
+      this.clock.runAll();
+
+      Blockly.clipboard.paste(data, this.workspace);
+      this.clock.runAll();
+      // After pasting, we should have gone from 2 to 4 blocks.
+      assert.equal(this.workspace.getBlocksByType('controls_if').length, 4);
+    });
+
     test('copied from a mutator pastes them into the mutator', async function () {
       const block = Blockly.serialization.blocks.append(
         {