Organize imports removes valid imports in Java files with compile errors

Organize imports will remove imports when the references are not valid Java code anymore. This might remove "valid" imports that just happen to be unused at that moment, because there is a compile error before the reference. The references cannot be easily restored once the compile errors are fixed, e.g. manually created static imports. This is problematic in long files with many imports and "editor.codeActionsOnSave" : ["source.organizeImports", ...]. A typo in the "wrong" place can easily remove all your imports.

Environment

• Operating System: Ubuntu 20.04.3 LTS
• JDK version: 11.0.6+10
• Visual Studio Code version: 1.63.2
• Java extension version: 1.2.0

Steps To Reproduce

1. Introduce an import
2. Create a compile error that will invalidate the reference

Current Result

All "unused" imports are removed.

Expected Result

Don't remove imports when the Java file has compile errors.

首先，使用包含一个 import 和编译错误的 Java 文件重现该问题，然后在保存时运行 Organize Imports 代码操作或 source.organizeImports。跟踪代码操作的处理过程，以确定编译错误如何影响未使用 import 的检测；当 Java 文件存在编译错误时仍能保留有效的 import，即表示完成。