Formatting a Java file sometimes eats parts of the code

This is similar to a bug that existed in Eclipse maybe 5 or 10 years ago.

Every now and then when you press format, part of the code is deleted. This is really super bad for any IDE, especially when you have auto format on save turned on. "Done with your changes? Sure, let me just save and commit. Why did you commit broken code, it doesn't even compile? %#€""

It seems like the formatter and also code highlighting gets out of sync with reality when this happens, e.g. in this example you can see that return is incorrectly colored.

https://user-images.githubusercontent.com/260340/138037841-aabf6088-d086-41f0-9908-98e3ec7eb555.mov

Environment

• Operating System: mac os Big Sur
• JDK version: 17
• Visual Studio Code version: 1.61.1
• Java extension version: 0.82.0

Steps To Reproduce

1. Use VS Code until it happens... there is no reliable way as far as I know

从提供的录制内容以及 issue 中描述的格式化程序和代码高亮行为开始，使用列出的 macOS、JDK 17、VS Code 1.61.1 和 Java extension 0.82.0 环境。重现间歇性失败，或缩小触发条件的范围，然后验证格式化不再删除代码，并且高亮显示仍保持同步。