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The codebase for filter api is overly complicated and confusing both from a users perspective and a developers perspective. A class based filter api would:
The default simple filter would be a Google-like single textbox. * It __may__ include a select list of fields to search. * The current search field searches the summary, description, steps to reproduce, additional information, issue bugnotes, bug id, and bugnote id fields. * The new search may include those fields as well as text based custom fields, tags, and in the future, expand to other fields.