Filter Results gadget's column configuration is lost after upgrade

Summary

After upgrading JIRA, the gadgets lose the default columns (issuetype, issuekey, priority, summary) and remain only with the non-default ones configured.
This happens only when the gadget was using the old method for storing the default values ("--Default--" in gadgetuserpreference table, column userprefvalue)

Steps to Reproduce

1. Have a gadget configured with the old configuration used by the default fields
2. Upgrade JIRA

Expected Results

Upgraded JIRA should display all gadgets as they were

Actual Results

Gadgets don't have the default columns displayed anymore

Solution / Workaround

Workaround 1
Manually add the columns back

Workaround 2
Replace the entities file entries containing the old value with the actual column names.

• • Original:

    <GadgetUserPreference id="10000" portletconfiguration="10000" userprefkey="columnNames" userprefvalue="--Default--|reporter|customfield_10143" />

  • Replaced:

    <GadgetUserPreference id="11158" portletconfiguration="10327" userprefkey="columnNames" userprefvalue="issuetype|issuekey|priority|summary|reporter|customfield_10143" />

Workaround 3

1. Run the query in the database :

   select * from gadgetuserpreference where userprefkey = 'columnNames' and userprefvalue like '%--Default--%'

2. For all those rows returned, verify the values in the older instance and then update the 'userprefvalue' column with the value from old(pre-upgrade) instance.

Workaround 4 (if you have an xml backup from the pre-upgrade instance)

1. Generate an xml backup from your instance
2. Find the parts where the gadgetuserpreference is stored.
3. Replace this part with the part from the older instance.
4. Restore the xml backup to the instance