🐛[BUG] 表头分组的情况下，使用列排序、编辑功能，固定列首和列尾的功能有问题

样例columns： {
title: '标题',
dataIndex: 'title',
copyable: true,
ellipsis: true,
tip: '标题过长会自动收缩',
formItemProps: {
rules: [
{
required: true,
message: '此项为必填项',
},
],
},
children:[
{
title:"内部分组1",
dataIndex: 'inner-one',
},
{
title:"内部分组2",
dataIndex: 'inner-two',
}
]
},

拖动排序内部分组1和内部分组2没法正常拖动，并且固定列也有问题

Start by reproducing the issue with the grouped columns example in the issue, focusing on dragging the two inner groups, column editing or sorting, and fixed columns. Compare the observed behavior with the expected drag-and-drop and fixed-column behavior; the issue is done when these operations work correctly with grouped columns.

Written by the indexing model from the issue text.