antdx sender slot 在一个slot前面回车之后, 那个回车删不了了

@dosu antdx sender slot 在一个slot前面回车之后, 那个回车删不了了
输入框Sender - Ant Design X: https://ant-design-x.antgroup.com/components/sender-cn

Reproduce the issue in the Sender demo linked in the report by inserting a line break before a slot, then attempting to delete it. Trace the Sender input and slot handling from the relevant component entry point; done means the line break before the slot can be removed normally and the regression is covered by a test.

Written by the indexing model from the issue text.