Hardcoded URL in common.js breaks Drupal installs not on site root.

I suppose the corollary to this is that file info does not degrade gracefully and presumably requires JS, although that probably doesn't block the main module from functioning.

A crude fix that works somewhat generically (for drupal in a subfolder of server root only - deeper trees would need a smarter regex - but these sites were only in a subfolder), was appending the following to the top of common.js.

var DRUPAL_BASE=window.location.pathname.replace(/\/([^/]*)\/.*/,'$1');

Then modifying the various url: `/...` to url: `/{DRUPAL_BASE}/..`

Ok... It turns out Drupal's solution for this is a lot simpler.
Drupal.url() automatically converts a relative Drupal path into a proper path considering the base.
So:

url: Drupal.url(`file-explorer/${fid}/upload-file/ajax`)

Will do the right thing. I'll add a patch to the current common.js in a moment.

Here's a few fixes. Regex for fixing in vim:

:%s@`/\([^`]*\)`@Drupal.url(`\1`)@g

Fixing it in an Apache config dynamically pending upstream fix (note this requires disabling Drupal JS aggregation or writing a more careful substitution):

        <LocationMatch "^/[^/]+/modules/contrib/media_folder_management/js/common.js">
            AddOutputFilter Sed js
            OutputSed "s|`/\([^`]*\)`|Drupal.url(`\1`)|"
        </LocationMatch> 

Aaaaand a patch of the common.js.

--- common.js   2025-08-19 12:20:41.007619081 -0400
+++ common.js.fixed     2025-08-19 14:05:16.985540157 -0400
@@ -105,7 +105,7 @@
         const details = `<div>${dataExtension} ${Drupal.t('file')}</div><div>${dataSize}</div>`;

         $.ajax({
-          url: `/admin/content/file-explorer/${folderId}/${mid}/preview/ajax`,
+          url: Drupal.url(`admin/content/file-explorer/${folderId}/${mid}/preview/ajax`),
           type: 'GET',
           success(result) {
             $('#preview .preview-contents').html('');
@@ -254,7 +254,7 @@
           .then((readerRs) => {
             if (readerRs) {
               $.ajax({
-                url: `/file-explorer/${fid}/upload-file/ajax`,
+                url: Drupal.url(`file-explorer/${fid}/upload-file/ajax`),
                 type: 'POST',
                 data: { request: readerRs },
                 cache: false,
@@ -267,7 +267,7 @@
                       });
                     }
                   }
-                  const url = `/file-explorer/${fid}`;
+                  const url = Drupal.url(`file-explorer/${fid}`);
                   const state = {
                     type: 'media-file-explorer',
                     url,
@@ -296,7 +296,7 @@
     ajaxMove(fid, toMove) {
       $('body').addClass('loading');
       $.ajax({
-        url: `/file-explorer/${fid}/move-into/ajax`,
+        url: Drupal.url(`file-explorer/${fid}/move-into/ajax`),
         type: 'POST',
         data: { objects: toMove },
         cache: false,
@@ -310,7 +310,7 @@
             }
           }
           if (result.messages[0].type === 'status') {
-            const url = `/file-explorer/${fid}`;
+            const url = Drupal.url(`file-explorer/${fid}`);
             const state = {
               type: 'media-file-explorer',
               url,