MergeHistoryPager.php

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<?php
class MergeHistoryPager extends ReverseChronologicalPager {

    public $mForm;

    public $mConds;

    public function __construct( SpecialMergeHistory $form, $conds, Title $source, Title $dest ) {
        $this->mForm = $form;
        $this->mConds = $conds;
        $this->title = $source;
        $this->articleID = $source->getArticleID();

        $dbr = wfGetDB( DB_REPLICA );
        $maxtimestamp = $dbr->selectField(
            'revision',
            'MIN(rev_timestamp)',
            [ 'rev_page' => $dest->getArticleID() ],
            __METHOD__
        );
        $this->maxTimestamp = $maxtimestamp;

        parent::__construct( $form->getContext() );
    }

    protected function getStartBody() {
        # Do a link batch query
        $this->mResult->seek( 0 );
        $batch = new LinkBatch();
        # Give some pointers to make (last) links
        $this->mForm->prevId = [];
        $rev_id = null;
        foreach ( $this->mResult as $row ) {
            $batch->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
            $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );

            if ( isset( $rev_id ) ) {
                if ( $rev_id > $row->rev_id ) {
                    $this->mForm->prevId[$rev_id] = $row->rev_id;
                } elseif ( $rev_id < $row->rev_id ) {
                    $this->mForm->prevId[$row->rev_id] = $rev_id;
                }
            }

            $rev_id = $row->rev_id;
        }

        $batch->execute();
        $this->mResult->seek( 0 );

        return '';
    }

    function formatRow( $row ) {
        return $this->mForm->formatRevisionRow( $row );
    }

    function getQueryInfo() {
        $conds = $this->mConds;
        $conds['rev_page'] = $this->articleID;
        $conds[] = "rev_timestamp < " . $this->mDb->addQuotes( $this->maxTimestamp );

        $revQuery = Revision::getQueryInfo( [ 'page', 'user' ] );
        return [
            'tables' => $revQuery['tables'],
            'fields' => $revQuery['fields'],
            'conds' => $conds,
            'join_conds' => $revQuery['joins']
        ];
    }

    function getIndexField() {
        return 'rev_timestamp';
    }
}