fix: should only generate new id when cross doc (#9009)

Closes: [BS-2162](https://linear.app/affine-design/issue/BS-2162/把-note-里的内容拖拽出来变成游离态，这个也成了复制)

packages/blocks/src/root-block/widgets/drag-handle/middleware/new-id-cross-doc.ts

@@ -0,0 +1,16 @@
+import type { BlockStdScope } from '@blocksuite/block-std';
+import type { JobMiddleware } from '@blocksuite/store';
+
+export const newIdCrossDoc =
+  (std: BlockStdScope): JobMiddleware =>
+  ({ slots, collection }) => {
+    let samePage = false;
+    slots.beforeImport.on(payload => {
+      if (payload.type === 'slice') {
+        samePage = payload.snapshot.pageId === std.doc.id;
+      }
+      if (payload.type === 'block' && !samePage) {
+        payload.snapshot.id = collection.idGenerator();
+      }
+    });
+  };

packages/blocks/src/root-block/widgets/drag-handle/watchers/drag-event-watcher.ts

@@ -36,7 +36,7 @@ import {
 import { addNoteAtPoint } from '../../../edgeless/utils/common.js';
 import { DropIndicator } from '../components/drop-indicator.js';
 import { AFFINE_DRAG_HANDLE_WIDGET } from '../consts.js';
-import { copyEmbedDoc } from '../middleware/copy-embed-doc.js';
+import { newIdCrossDoc } from '../middleware/new-id-cross-doc.js';
 import { surfaceRefToEmbed } from '../middleware/surface-ref-to-embed.js';
 import { containBlock, includeTextSelection } from '../utils.js';
 
@@ -114,6 +114,7 @@ export class DragEventWatcher {
 
   private _dropHandler = (context: UIEventStateContext) => {
     this._onDrop(context);
+    this._std.selection.setGroup('gfx', []);
     this.widget.clearRaf();
     this.widget.hide(true);
   };
@@ -437,7 +438,7 @@ export class DragEventWatcher {
     const std = this._std;
     return new Job({
       collection: std.collection,
-      middlewares: [copyEmbedDoc, surfaceRefToEmbed(std)],
+      middlewares: [newIdCrossDoc(std), surfaceRefToEmbed(std)],
     });
   }
 

tests/linked-page.spec.ts

@@ -837,7 +837,7 @@ test('linked doc can be dragged from note to surface top level block', async ({
   await dragBlockToPoint(page, '9', { x: 200, y: 200 });
 
   await waitNextFrame(page);
-  await assertParentBlockFlavour(page, '10', 'affine:surface');
+  await assertParentBlockFlavour(page, '9', 'affine:surface');
 });
 
 // Aliases