#### What this PR does / why we need it?
#### Summary of your change
#### Please indicate you've done the following:
- [ ] Made sure tests are passing and test coverage is added if needed.
- [ ] Made sure commit message follow the rule of [Conventional Commits specification](https://www.conventionalcommits.org/).
- [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.
#### What this PR does / why we need it?
Refs #5356
#### Summary of your change
检测文本是否编辑，退出/切换文件作出提示，可以重置当前修改！
#### Please indicate you've done the following:
- [ ] Made sure tests are passing and test coverage is added if needed.
- [ ] Made sure commit message follow the rule of [Conventional Commits specification](https://www.conventionalcommits.org/).
- [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.
#### What this PR does / why we need it?
Refs #5431
#### Summary of your change
支持预览 pdf/word/excel/image/video/audio
#### Please indicate you've done the following:
- [ ] Made sure tests are passing and test coverage is added if needed.
- [ ] Made sure commit message follow the rule of [Conventional Commits specification](https://www.conventionalcommits.org/).
- [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.
Refs: #3624
#### What this PR does / why we need it?
#### Summary of your change
#### Please indicate you've done the following:
- [ ] Made sure tests are passing and test coverage is added if needed.
- [ ] Made sure commit message follow the rule of [Conventional Commits specification](https://www.conventionalcommits.org/).
- [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.
