feat(editor): support delete in flat block proxy (#9994)

blocksuite/framework/store/src/__tests__/block.unit.spec.ts

@@ -452,6 +452,33 @@ describe('flat', () => {
       expect.anything()
     );
 
+    onChange.mockClear();
+    onColUpdated.mockClear();
+    delete (model.props.cols.a as Record<string, unknown>).color;
+    expect(yBlock.get('prop:cols.a.color')).toBe(undefined);
+    expect(model.props.cols.a).toEqual({});
+    expect(model.props.cols$.value).toEqual({ a: {} });
+    expect(onColUpdated).toHaveBeenCalledTimes(1);
+    expect(onChange).toHaveBeenCalledTimes(1);
+    expect(onChange).toHaveBeenCalledWith(
+      expect.anything(),
+      'cols',
+      expect.anything()
+    );
+
+    model.props.cols = {
+      a: { color: 'red' },
+      b: { color: 'blue' },
+    };
+    onChange.mockClear();
+    onColUpdated.mockClear();
+    delete (model.props as Record<string, unknown>).cols;
+    expect(model.props.cols$.value).toBeUndefined();
+    expect(yBlock.get('prop:cols.a.color')).toBe(undefined);
+    expect(yBlock.get('prop:cols.b.color')).toBe(undefined);
+    expect(onColUpdated).toHaveBeenCalledTimes(1);
+    expect(onChange).toHaveBeenCalledTimes(1);
+
     onChange.mockClear();
     model.props.title.insert('test', 0);
     expect((yBlock.get('prop:title') as Y.Text).toJSON()).toBe('test');
@@ -483,6 +510,16 @@ describe('flat', () => {
       'labels',
       expect.anything()
     );
+
+    onChange.mockClear();
+    model.props.labels.splice(0, 1);
+    expect(getLabels().toJSON()).toEqual([]);
+    expect(model.props.labels$.value).toEqual([]);
+    expect(onChange).toHaveBeenCalledWith(
+      expect.anything(),
+      'labels',
+      expect.anything()
+    );
   });
 
   test('stash and pop', () => {