[NBSP] can't show correctly

[Heliner]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error
   line 13 has an error show of "NBSP", also exist in markdown view ， the leetcode url : https://leetcode-cn.com/problems/add-digits/
   
   Software versions(Help -> About)

• Product: [e.g IDEA 2020.2] IntelliJ IDEA 2021.3 (Ultimate Edition)
• Runtime version:[e.g 11.0.7+10-b944.20 amd64]
• VM:[e.g OpenJDK 64-Bit Server VM by JetBrains s.r.o.]
• OS:[e.g Windows 10] MacOs 12.1