+* The backwards-compatibility code in HTMLForm to add a drop-down control to an
+ option that is not set to be a drop-down if the "mw-chosen" class is present,
+ is now removed.
+* Several collations were removed. They were workarounds for bugs in the ICU
+ library and they are no longer needed (as of ICU 57.1):
+ * 'uppercase-se' (NorthernSamiUppercaseCollation) - use 'uca-se' instead
+ * 'xx-uca-et' (CollationEt) - use 'uca-et' instead
+ * 'xx-uca-fa' (CollationFa) - use 'uca-fa' instead
+* The hooks 'SpecialRecentChangesFilters' & 'SpecialWatchlistFilters' deprecated
+ in 1.23 were removed. Instead, use 'ChangesListSpecialPageStructuredFilters'.
+ The ChangesListSpecialPage code for these legacy hooks, and their use in
+ SpecialRecentchanges.php and SpecialWatchlist, was also removed:
+ * ChangesListSpecialPage->getCustomFilters()
+ * ChangesListSpecialPage->getFilterGroupDefinitionFromLegacyCustomFilters()
+ * ChangesListSpecialPage::customFilters
+* The global function wfUseMW, deprecated since 1.26, has now been removed. Use
+ the "requires" property of static extension registration instead.