This is a simple change to automatically generate `id` attributes for HTML headers in documentation comments.
I decided to leave the functionality in `HtmlDocletWriter` rather than moving it to `HtmlIds` because it uses the same helper methods as`commentTagsToContent`. The value of the `id` attribute id derived from the content of the header tag with spaces and other non-word characters replaced by `-`. A `-hdr` suffix is appended to avoid collisions with other ids. If there are duplicate values an int counter is appended to make them unique. ------------- Commit messages: - Remove trailing whitespace - JDK-8289332: Auto-generate ids for user-defined headings Changes: https://git.openjdk.org/jdk/pull/9627/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9627&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8289332 Stats: 184 lines in 4 files changed: 173 ins; 6 del; 5 mod Patch: https://git.openjdk.org/jdk/pull/9627.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9627/head:pull/9627 PR: https://git.openjdk.org/jdk/pull/9627
