Clean up and update documentation for Title::isAlwaysKnown()

diff --git a/includes/Title.php b/includes/Title.php
index fa02564..7a459bd 100644 (file)
--- a/includes/Title.php
+++ b/includes/Title.php
@@ -2474,16 +2474,15 @@ class Title {
        }
 
        /**
-        * Should a link should be displayed as a known link, just based on its title?
+        * Do we know that this title definitely exists, or should we otherwise
+        * consider that it exists?
         *
-        * Currently, a self-link with a fragment and special pages are in
-        * this category. System messages that have defined default values are also
-        * always known.
+        * @return bool
         */
        public function isAlwaysKnown() {
-               return ( $this->isExternal() ||
-                        ( 0 == $this->mNamespace && "" == $this->mDbkeyform ) ||
-                        ( NS_MEDIAWIKI == $this->mNamespace && wfMsgWeirdKey( $this->mDbkeyform ) ) );
+               return $this->isExternal()
+                       || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
+                       || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $this->mDbkeyform ) );
        }
 
        /**