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Introduced the more general concept of filter (facets are now filters). This has no visible impact on the UI but is essential groundwork for future improvements.
Rewrote the query building code around keyword search and removed a temporary table. This improves performance slightly.
Avoided conditions on node type whenever possible, to simplify queries.
Use a single filter for keyword search (instead of one per operator). These types of filters are now referred to as "fields".
Administer keyword search filters (fields) separately from facets.
Added internal weight to categories (for sorting purposes).
Added utility functions for extracting quoted strings from the search text.
Moved parsing of search keywords into a separate function (allows re-use).
Faceted Search Views: #233089: Fixed errors with PHP 4.
#170959: Added support for multiple search environments.
Rewrote much of the administration interface to support multiple environments and improve usability. The administration interface is now more similar to Views'.
Made the base path of search URLs customizable.
Made the title of search pages customizable.
Made all blocks optional (per-environment).
Added the start page to the breadcrumb of search pages.
Allowed facets to be disabled independently of their provider module.
#191298: Added option for selective use of the Extracts display style (only when keywords are actually used in the current search).
Made the Teasers display style the default (instead of the Extracts style).
Changed the search term remover link to 'x' instead of '-' (per patrickharris's suggestion).
Turned tooltips off by default.
Separated disabled facets from enabled ones to make administration easier.
Allowed category labels to contain HTML (needed for CCK Facets).
This version contains experimental and unfinished features. Use it only if you wish to test it or help with development. Not recommended for use on production sites.