MediaWiki:Common.js

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// Make image links open the full resolution image directly
$(document).ready(function() {
    $('.mw-parser-output a.image').each(function() {
        var $link = $(this);
        var $img = $link.find('img');
        
        if ($img.length) {
            var src = $img.attr('src');
            
            // Convert thumbnail URL to full image URL
            // From: /images/thumb/f/fd/Sunny_Meadows.png/300px-Sunny_Meadows.png
            // To: /images/f/fd/Sunny_Meadows.png
            var fullSrc = src.replace(/\/thumb(\/[^\/]+\/[^\/]+\/)(\d+px-)?(.+)$/, '$1$3');
            
            // Update the link href
            $link.attr('href', fullSrc);
        }
    });
});