UnsupportedSlotDiffRenderer.php

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<?php
class UnsupportedSlotDiffRenderer extends SlotDiffRenderer {
 
    private $localizer;
 
    public function __construct( MessageLocalizer $localizer ) {
        $this->localizer = $localizer;
    }
 
    public function getDiff( Content $oldContent = null, Content $newContent = null ) {
        $this->normalizeContents( $oldContent, $newContent );
 
        $oldModel = $oldContent->getModel();
        $newModel = $newContent->getModel();
 
        if ( $oldModel !== $newModel ) {
            $msg = $this->localizer->msg( 'unsupported-content-diff2', $oldModel, $newModel );
        } else {
            $msg = $this->localizer->msg( 'unsupported-content-diff', $oldModel );
        }
 
        return Html::rawElement(
            'tr',
            [],
            Html::rawElement(
                'td',
                [ 'colspan' => 4, 'class' => 'error' ],
                $msg->parse()
            )
        );
    }
 
}