Magento product images duplicate issue with CSV product importer

Our client likes to leave images on media/import folder and when they import csv, if product image already existed, it was creating duplicate image.

So below is a quick workaround to fix this issue. Here we are just deleting previous images if we are going to re-import them again.

There could be a simpler solution but this worked for me.

@file app/code/core/Mage/Catalog/Model/Convert/Adapter/Product.php
// @method public function saveRow( array $importData )

$attributes = $product->getTypeInstance()->getSetAttributes();
if (isset($attributes['media_gallery'])) {
    $gallery = $attributes['media_gallery'];
    //Get the images
    $galleryData = $product->getMediaGallery();
    $csvImages = array();
    if ( !empty( $importData['gallery'] ) ) {
        $csvImages = explode( ',', $importData["gallery"] );
    }
    $csvImages[] = $importData['image'];
    foreach($csvImages as $img){
        $importDataImage = explode('/',trim($importData['image'],'/'));
        $importDataImage = array_pop($importDataImage); // get filename part only
        $importDataImage = str_replace('\\', '/', Mage_Core_Model_File_Uploader::getDispretionPath($importDataImage) . '/' . $importDataImage); // replace windows directory_separator with linux one
        $galleryData['images'][]['file'] = $importDataImage; /* add this new image file from csv to list of images that needs to be removed if that exists. */
    }
    // now delete all previous images.
    if (!empty($galleryData)) {
        foreach ($galleryData['images'] as $image) {
            //If image exists
            if ($gallery->getBackend()->getImage($product, $image['file'])) {
                $gallery->getBackend()->removeImage($product, $image['file']);
            }
            $imageOldFile = Mage::getBaseDir('media') . DS . 'catalog' . DS . 'product' . $image['file'];
            /*delete any previous image imports, that still exists on the server*/
            if (file_exists($imageOldFile)) {
                unlink($imageOldFile);
            }
        }
    }
}

After you delete previous images, you can proceed with core code that will re-import image from media/import.