a security fix (bug 42202).
* Added the ability to limit the wall clock time used by shell processes,
as well as the CPU time. Configurable with $wgMaxShellWallClockTime.
-* Added $wgWhitelistReadRegexp for regex whitelisting
+* Added $wgWhitelistReadRegexp for regex whitelisting.
+* (bug 5346) Categories that are redirects will be displayed italic in
+ the category links section at the bottom of a page.
+* (bug 43915) New maintenance script deleteEqualMessages.php.
+* New collation uppercase-sv, which is like uppercase, but adapted
+ to Swedish sort order.
=== Bug fixes in 1.21 ===
* (bug 40353) SpecialDoubleRedirect should support interwiki redirects.
* (bug 43849) ApiQueryImageInfo no longer throws exceptions with ForeignDBRepo
redirects.
* On error, any warnings generated before that error will be shown in the result.
+* action=help suports generalized submodules (modules=query+value), querymodules obsolete
=== API internal changes in 1.21 ===
* For debugging only, a new global $wgDebugAPI removes many API restrictions when true.
Never use on the production servers, as this flag introduces security holes.
Whenever enabled, a warning will also be added to all output.
+* ApiModuleManager now handles all submodules (actions,props,lists) and instantiation
+* Query stores prop/list/meta as submodules
=== Languages updated in 1.21 ===