[Bug Report] 表格所见即所得编辑模式需要加强对嵌套语法的支持

[AnkioTomas]

Prerequisites

• [ ] There isn't an existing issue that reports the same bug to avoid duplicates.
• [ ] The provided information offers a minimal reproducible example of the bug.
• [ ] For Q&A, please open a GitHub Discussion instead.

Describe the Bug

测试语法

| Header | Header | Header | Header |
| ------ | ------ | ------ | ------ |
| Sample | Sample | Sample |\| Syntax \| Description \|<br>\| ----------- \| ----------- \|<br>\| Header \| Title \|<br>\| Paragraph \| Text \||
| Sample | Sample | Sample | Sample |
| Sample | Sample | Sample | Sample |
| Sample | Sample | Sample | Sample |
| Sample | Sample | Sample | Sample |

点击编辑后，只获取到了转义符号\

Reproduction Steps

No response

System Information

No response

Contributing

No, I don't plan to at this time.