pdf文件很大的时候比如一个119页的pdf滚动到最后面时 加载数据错乱，频繁刷新

[Victor2018]

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

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.

[github-actions[bot]]

Thank you for creating your first issue. We appreciate your help in making this project better. We will look into it, and get back to you soon.

[afreakyelf]

Closing as the issue is not clear.