[Integrated] RFR: Improve combining of nested review replies

[Robin Westberg]

Changeset: b20675b5
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2020-02-26 11:01:41 +0000
URL:       https://git.openjdk.java.net/skara/commit/b20675b5

Improve combining of nested review replies

Reviewed-by: ehelin

! bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/ReviewArchive.java
! bots/mlbridge/src/test/java/org/openjdk/skara/bots/mlbridge/MailingListBridgeBotTests.java