No report for two Classes in the same package with same name

Just as the title says, eclipse will report it.

Environment

• Operating System: Windows 10
• JDK version: 1.8.0_161
• Visual Studio Code version: 1.39.2
• Java extension version: 0.51.0

Steps To Reproduce

// src/test/C1.java
package test;
public class C1 {}
class Same {}

// src/test/C2.java
package test;
public class C2 {}
class Same {}

Current Result

No problem dectected.
Fail to build.

使用 src/test/C1.java 和 src/test/C2.java 重现该问题，这两个文件分别声明同一个 package-private 类，并确认 extension 在构建失败之前没有报告任何问题。跟踪处理重复类的 Java diagnostics 入口点，然后验证重复名称问题是否在构建失败之前或同时被报告。