RFR: 6872: Add butterfly/sandwich view to JMC [v2]

Wed Feb 4 14:34:40 UTC 2026

On Mon, 8 Dec 2025 20:20:47 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> This PR adds a butterfly (aka sandwich) view to JMC, showing all the callers and callees for a selected method. 
>> 
>> <img width="2548" height="1224" alt="buttefly" src="https://github.com/user-attachments/assets/ad3d33d8-944b-49d6-be98-62444f11da93" />
>> 
>> Also fixes annoying spelling error.
>
> Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Spotbugs fix

Marked as reviewed by aptmac (Reviewer).

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PR Review: https://git.openjdk.org/jmc/pull/693#pullrequestreview-3751413321