RFR: 8307652: sealed class hierarchy graph doesn't distinguish non-sealed classes [v2]

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Hi, Jonathan Gibbons, would you mind taking a look at this and approve
if this looks good? I wish to get this into JDK 21 before RDP 1
starts.


On Mon, May 22, 2023 at 2:25 AM Per Minborg <pminborg at openjdk.org> wrote:
>
> On Tue, 16 May 2023 17:16:57 GMT, Chen Liang <liach at openjdk.org> wrote:
>
> >> `@sealedGraph` had a mechanism to render non-sealed classes differently, but it's useless because the graph nodes are not bordered. This patch converts the non-sealed classes to be rendered in italics instead.
> >>
> >> An example of `ConstantDesc`, which has a sealed hierarchy except `DynamicConstantDesc`:
> >> JDK 20:
> >> ![image](https://user-images.githubusercontent.com/7806504/236991678-e30c181a-cb1f-407a-b3e0-f648fe2df788.png)
> >>
> >> This patch:
> >> ![image](https://github.com/openjdk/jdk/assets/7806504/4fb8ec10-4f10-4902-8b9d-107b3644b2cf)
> >
> > Chen Liang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> >
> >  - Use an edge and node to indicate non-sealed hierarchy
> >  - Merge branch 'master' into fix/sealedgraph-nonsealed
> >  - 8307652: sealed class hierarchy graph doesn't distinguish non-sealed classes
>
> Marked as reviewed by pminborg (Committer).
>
> -------------
>
> PR Review: https://git.openjdk.org/jdk/pull/13877#pullrequestreview-1435944754