Please review this patch to improve the javadoc preview header. The parent bug include more details.
This is meant to prevent a bug where, if a non preview class extend an `@PreviewFeature` interface, the Javadoc displays `Programs can only use <<Type>> when preview features are enabled` when the API can be used without enable preview features as long as we don't refer to any methods in the supertype This is specifically the case in #17543. Here is the javadoc output [AsymmetricKey](https://cr.openjdk.org/~nbenalla/GeneratedDocs/8343239-2/docs/api/java.base/java/security/AsymmetricKey.html) after merging this branch with the PR `298420: PEM API: Implementation (Preview) #17543`. The only files affected by this change are the class `DEREncodable` and it's Subinterfaces. One other bug I noticed is that, on the `DEREncodable` page, it's direct subinterfaces had the superscript `PREVIEW` link. I've added a condition to remove it. ------------- Commit messages: - remove unused import - improve preview label message - fix preview bug Changes: https://git.openjdk.org/jdk/pull/22126/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22126&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8343239 Stats: 163 lines in 7 files changed: 154 ins; 0 del; 9 mod Patch: https://git.openjdk.org/jdk/pull/22126.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22126/head:pull/22126 PR: https://git.openjdk.org/jdk/pull/22126
