RFR: 905: Github UI code markdown can fail to get copied correctly into email

Fri Apr 9 22:13:07 UTC 2021

On Fri, 9 Apr 2021 15:30:42 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> When filtering out certain markdown for sending plain-text emails, only remove multiline code formatting block markers and retain inline ones.

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/1112