Issue #3426391 by Grimreaper: Override drupal.active-link library

Closes #3426391

assets/js/misc/active-link.js

+/**
+ * @file
+ * Attaches behaviors for Drupal's active link marking.
+ */
+
+((Drupal, drupalSettings) => {
+  const activeClass = 'active';
+
+  /**
+   * Append active class.
+   *
+   * The link is only active if its path corresponds to the current path, the
+   * language of the linked path is equal to the current language, and if the
+   * query parameters of the link equal those of the current request, since the
+   * same request with different query parameters may yield a different page
+   * (e.g. pagers, exposed View filters).
+   *
+   * Does not discriminate based on element type, so allows you to set the
+   * active class on any element: a, li…
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.activeLinks = {
+    attach(context) {
+      // Start by finding all potentially active links.
+      const { path } = drupalSettings;
+      const queryString = JSON.stringify(path.currentQuery);
+      const querySelector = path.currentQuery
+        ? `[data-drupal-link-query='${queryString}']`
+        : ':not([data-drupal-link-query])';
+      const originalSelectors = [
+        `[data-drupal-link-system-path="${path.currentPath}"]`,
+      ];
+      let selectors;
+
+      // If this is the front page, we have to check for the <front> path as
+      // well.
+      if (path.isFront) {
+        originalSelectors.push('[data-drupal-link-system-path="<front>"]');
+      }
+
+      // Add language filtering.
+      selectors = [].concat(
+        // Links without any hreflang attributes (most of them).
+        originalSelectors.map((selector) => `${selector}:not([hreflang])`),
+        // Links with hreflang equals to the current language.
+        originalSelectors.map(
+          (selector) => `${selector}[hreflang="${path.currentLanguage}"]`,
+        ),
+      );
+
+      // Add query string selector for pagers, exposed filters.
+      selectors = selectors.map((current) => current + querySelector);
+
+      // Query the DOM.
+      const activeLinks = context.querySelectorAll(selectors.join(','));
+      const il = activeLinks.length;
+      for (let i = 0; i < il; i++) {
+        activeLinks[i].classList.add(activeClass);
+      }
+    },
+    detach(context, settings, trigger) {
+      if (trigger === 'unload') {
+        const activeLinks = context.querySelectorAll(
+          `[data-drupal-link-system-path].${activeClass}`,
+        );
+        const il = activeLinks.length;
+        for (let i = 0; i < il; i++) {
+          activeLinks[i].classList.remove(activeClass);
+        }
+      }
+    },
+  };
+})(Drupal, drupalSettings);