RFR: 8294066: IGV: Graph changes when deleting a graph in the same group with smaller index [v2]

[Koichi Sakata]

On Thu, 26 Jan 2023 09:19:37 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

> Please update the copyright year and remove unused imports, otherwise it looks good to me.

@robcasloz  Thank you for your kind advice! I've fixed them.

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PR: https://git.openjdk.org/jdk/pull/12210