Enh: Implement message excerpt filters for JIRA messages, others

[ShaneCurcuru]

Reading through a project list that has a lot of JIRA notifications is not very useful, since the displayed excerpt of the body of every message is:

[ https://issues.apache.org/jira/browse/REEF-1999?page=com.blahblahblah...

Adding pluggable filter API for the display of body excerpts that allows admin-configured filters for the excerpts would be very valuable. A JIRA filter would be reasonably easy to detect a mail is from an automated JIRA notice, and could instead display the first text content of the mail, after the various JIRA headers.

[Humbedooh]

This could, in theory, be part of the JS code that extrapolates quoted messages. You could extend the function that looks for quotes to also include this, and have it wrap jira headers into a quote box.