fix: flyout id is different than first placed block

core/flyout_base.ts

@@ -1213,7 +1213,7 @@ export abstract class Flyout extends DeleteArea implements IFlyout {
 
     // Clone the block.
     // TODO(#7432): Add a saveIds parameter to `save`.
-    const json = blocks.save(oldBlock) as blocks.State;
+    const json = blocks.save(oldBlock, {saveIds: false}) as blocks.State;
     // Normallly this resizes leading to weird jumps. Save it for terminateDrag.
     targetWorkspace.setResizesEnabled(false);
     const block = blocks.append(json, targetWorkspace) as BlockSvg;

core/serialization/blocks.ts

@@ -86,20 +86,21 @@ export function save(
     addInputBlocks = true,
     addNextBlocks = true,
     doFullSerialization = true,
+    saveIds = true,
   }: {
     addCoordinates?: boolean;
     addInputBlocks?: boolean;
     addNextBlocks?: boolean;
     doFullSerialization?: boolean;
+    saveIds?: boolean;
   } = {},
 ): State | null {
   if (block.isInsertionMarker()) {
     return null;
   }
-
   const state = {
     'type': block.type,
-    'id': block.id,
+    'id': saveIds ? block.id : undefined,
   };
 
   if (addCoordinates) {
@@ -122,12 +123,22 @@ export function save(
   if (addInputBlocks) {
     // AnyDuringMigration because:  Argument of type '{ type: string; id:
     // string; }' is not assignable to parameter of type 'State'.
-    saveInputBlocks(block, state as AnyDuringMigration, doFullSerialization);
+    saveInputBlocks(
+      block,
+      state as AnyDuringMigration,
+      doFullSerialization,
+      saveIds,
+    );
   }
   if (addNextBlocks) {
     // AnyDuringMigration because:  Argument of type '{ type: string; id:
     // string; }' is not assignable to parameter of type 'State'.
-    saveNextBlocks(block, state as AnyDuringMigration, doFullSerialization);
+    saveNextBlocks(
+      block,
+      state as AnyDuringMigration,
+      doFullSerialization,
+      saveIds,
+    );
   }
 
   // AnyDuringMigration because:  Type '{ type: string; id: string; }' is not
@@ -270,6 +281,7 @@ function saveInputBlocks(
   block: Block,
   state: State,
   doFullSerialization: boolean,
+  saveIds: boolean,
 ) {
   const inputs = Object.create(null);
   for (let i = 0; i < block.inputList.length; i++) {
@@ -278,6 +290,7 @@ function saveInputBlocks(
     const connectionState = saveConnection(
       input.connection as Connection,
       doFullSerialization,
+      saveIds,
     );
     if (connectionState) {
       inputs[input.name] = connectionState;
@@ -301,13 +314,15 @@ function saveNextBlocks(
   block: Block,
   state: State,
   doFullSerialization: boolean,
+  saveIds: boolean,
 ) {
   if (!block.nextConnection) {
     return;
   }
   const connectionState = saveConnection(
     block.nextConnection,
     doFullSerialization,
+    saveIds,
   );
   if (connectionState) {
     state['next'] = connectionState;
@@ -326,6 +341,7 @@ function saveNextBlocks(
 function saveConnection(
   connection: Connection,
   doFullSerialization: boolean,
+  saveIds: boolean,
 ): ConnectionState | null {
   const shadow = connection.getShadowState(true);
   const child = connection.targetBlock();
@@ -337,7 +353,7 @@ function saveConnection(
     state['shadow'] = shadow;
   }
   if (child && !child.isShadow()) {
-    state['block'] = save(child, {doFullSerialization});
+    state['block'] = save(child, {doFullSerialization, saveIds});
   }
   return state;
 }

tests/mocha/jso_serialization_test.js

@@ -61,6 +61,12 @@ suite('JSO Serialization', function () {
       assertProperty(jso, 'id', 'id0');
     });
 
+    test('saveId false', function () {
+      const block = this.workspace.newBlock('row_block');
+      const jso = Blockly.serialization.blocks.save(block, {saveIds: false});
+      assertProperty(jso, 'id', undefined);
+    });
+
     suite('Attributes', function () {
       suite('Collapsed', function () {
         test('True', function () {