Import that is used in @code or @link in JavaDoc is marked as unused

Imports that are only used in @code or @link of JavaDoc are marked as unused and Organize imports will remove them.

Environment

• Operating System: 20.04.2 LTS (Focal Fossa)
• JDK version: openjdk 11.0.6 2020-01-14
• Visual Studio Code version: 1.58.2
• Java extension version: v.0.81.0

Steps To Reproduce

1. Check out https://github.com/fvclaus/vscode-java-javadoc-link-bug and open App.java
2. Run Organize imports

import java.util.HashSet;

/**
 * Uses {@code HashSet#clear()}
 *
 */

Current Result

Import is marked as unused and will be removed with Organize imports.

Expected Result

Import is not marked as unused and will not be removed with Organize imports.

从 issue 中链接的 App.java 复现开始，运行 Organize imports，以确认 {@code} 中的 HashSet 引用是如何处理的。根据该行为，跟踪未使用 import 的分析以及 JavaDoc 引用的处理。完成标准是：仅在 JavaDoc 中使用的 import 不会被 Organize imports 标记为未使用或删除。