- if( ( $oldid = $wgRequest->getInt( 'oldid' ) )
- && ( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) ) {
- // Allow oldid to override a changed or missing title.
- $rev = Revision::newFromId( $oldid );
- if( $rev ) {
- $ret = $rev->getTitle();
+ # For non-special titles, check for implicit titles
+ if( is_null( $ret ) || $ret->getNamespace() != NS_SPECIAL ) {
+ // We can have urls with just ?diff=,?oldid= or even just ?diff=
+ $oldid = $wgRequest->getInt( 'oldid' );
+ $oldid = $oldid ? $oldid : $wgRequest->getInt( 'diff' );
+ // Allow oldid to override a changed or missing title
+ if( $oldid ) {
+ $rev = Revision::newFromId( $oldid );
+ $ret = $rev ? $rev->getTitle() : $ret;