Text to go in the release notes:
This fixes usability and consistency issues with the staff interface search header. Retaining or clearing search terms between searches is now configurable using two new system preferences - RetainCatalogSearchTerms (for searching the catalog) and RetainPatronsSearchTerms (for check out and searching patrons). Previously, search terms were retained when 1) searching the catalog and then switching to check out, check in, or renew 2) searching from the check out or search patrons and then switching to check in, renew and search catalog. This then required manually clearing the input field.