Include Return Type Annotations in Method Hover Tooltip

Description
When hovering over a method in the editor, the tooltip currently shows the method signature and Javadoc (if available). However, annotations applied to the method’s return type are not displayed.

This feature request proposes enhancing the hover tooltip to include annotations declared on the return type.

Example

public @Nullable String getName() {
    return name;
}

or with type-use annotations:

public List<@NonNull String> getNames() {
    return names;
}

Current Behavior:
Hover tooltip shows:

String getName()

Expected Behavior:
Hover tooltip shows:

@Nullable String getName()

and for generics:

List<@NonNull String> getNames()

Motivation / Use Case
Return type annotations (e.g., nullability annotations like @Nullable, @NonNull, or custom type-use annotations) are critical for understanding API contracts, static analysis, and preventing runtime errors.

Not displaying them in hover:

• Hides important semantic information
• Forces developers to navigate to the declaration
• Reduces the usefulness of hover as a quick inspection tool

まず、VS Code 拡張機能内の Java のホバーツールチップ実装を見つけ、メソッドシグネチャがどのようにレンダリングされるかを追跡します。期待されるケースとして @Nullable と List<@NonNull String> の例を使用します。宣言の戻り値アノテーションと型使用の戻り値アノテーションの両方がホバー出力に表示され、対応するテストが追加または更新されていれば完了です。