Spoilered images do not show the filename, use the .title of the fileinfo.

4chan_x.user.js

@@ -487,6 +487,15 @@
       $.add(d.head, script);
       return $.rm(script);
     },
+    shortenFilename: function(filename, isOP) {
+      var threshold;
+      threshold = isOP ? 40 : 30;
+      if (filename.replace(/\.\w+$/, '').length > threshold) {
+        return "" + filename.slice(0, threshold - 5) + "(...)" + (filename.match(/\.\w+$/));
+      } else {
+        return filename;
+      }
+    },
     bytesToString: function(size) {
       var unit;
       unit = 0;
@@ -3378,23 +3387,23 @@
       return Main.callbacks.push(this.node);
     },
     node: function(post) {
-      var alt, node, span;
+      var alt, filename, node, _ref;
       if (post.isInlined && !post.isCrosspost || !post.fileInfo) {
         return;
       }
       node = post.fileInfo.firstElementChild;
       alt = post.img.alt;
-      span = $('span', node);
+      filename = ((_ref = $('span', node)) != null ? _ref.title : void 0) || node.title;
       FileInfo.data = {
         link: post.img.parentNode.href,
         spoiler: /^Spoiler/.test(alt),
         size: alt.match(/\d+\.?\d*/)[0],
         unit: alt.match(/\w+$/)[0],
-        resolution: span.previousSibling.textContent.match(/\d+x\d+|PDF/)[0],
-        fullname: span.title,
-        shortname: span.textContent
+        resolution: node.textContent.match(/\d+x\d+|PDF/)[0],
+        fullname: filename,
+        shortname: $.shortenFilename(filename, post.isOP)
       };
-      node.setAttribute('data-filename', span.title);
+      node.setAttribute('data-filename', filename);
       return node.innerHTML = FileInfo.funk(FileInfo);
     },
     setFormats: function() {
@@ -3537,7 +3546,7 @@
       }
     },
     parseArchivedPost: function(req, board, postID, root, cb) {
-      var bq, br, capcode, data, email, file, filename, filesize, isOP, name, nameBlock, pc, pi, piM, span, spoiler, subject, threadID, threshold, thumb_src, timestamp, trip, userID;
+      var bq, br, capcode, data, email, file, filename, filesize, isOP, name, nameBlock, pc, pi, piM, span, spoiler, subject, threadID, thumb_src, timestamp, trip, userID;
       data = JSON.parse(req.response);
       $.addClass(root, 'archivedPost');
       if (data.error) {
@@ -3710,8 +3719,7 @@
         }));
         span = $('span[title]', file);
         span.title = filename;
-        threshold = isOP ? 40 : 30;
-        span.textContent = filename.replace(/\.\w+$/, '').length > threshold ? "" + filename.slice(0, threshold - 5) + "(...)" + (filename.match(/\.\w+$/)) : filename;
+        span.textContent = $.shortenFilename(filename, isOP);
         thumb_src = data.media_status === 'available' ? "src=" + data.thumb_link : '';
         $.add(file, $.el('a', {
           className: spoiler ? 'fileThumb imgspoiler' : 'fileThumb',

changelog

@@ -1,4 +1,6 @@
 master
+-Mayhem
+  Fix support of change in 4chan's HTML about hidden filename in case of spoiler.
 
 2.34.5
 - Mayhem

script.coffee

@@ -368,6 +368,15 @@ $.extend $,
     script = $.el 'script', textContent: code
     $.add d.head, script
     $.rm script
+  shortenFilename: (filename, isOP) ->
+    # FILENAME SHORTENING SCIENCE:
+    # OPs have a +10 characters threshold.
+    # The file extension is not taken into account.
+    threshold = if isOP then 40 else 30
+    if filename.replace(/\.\w+$/, '').length > threshold
+      "#{filename[...threshold - 5]}(...)#{filename.match(/\.\w+$/)}"
+    else
+      filename
   bytesToString: (size) ->
     unit = 0 # Bytes
     while size >= 1024
@@ -2675,17 +2684,17 @@ FileInfo =
     return if post.isInlined and not post.isCrosspost or not post.fileInfo
     node = post.fileInfo.firstElementChild
     alt  = post.img.alt
-    span = $ 'span', node
+    filename = $('span', node)?.title or node.title
     FileInfo.data =
       link:       post.img.parentNode.href
       spoiler:    /^Spoiler/.test alt
       size:       alt.match(/\d+\.?\d*/)[0]
       unit:       alt.match(/\w+$/)[0]
-      resolution: span.previousSibling.textContent.match(/\d+x\d+|PDF/)[0]
-      fullname:   span.title
-      shortname:  span.textContent
+      resolution: node.textContent.match(/\d+x\d+|PDF/)[0]
+      fullname:   filename
+      shortname:  $.shortenFilename filename, post.isOP
     # XXX GM/Scriptish
-    node.setAttribute 'data-filename', span.title
+    node.setAttribute 'data-filename', filename
     node.innerHTML = FileInfo.funk FileInfo
   setFormats: ->
     code = Conf['fileInfo'].replace /%([BKlLMnNprs])/g, (s, c) ->
@@ -2954,15 +2963,7 @@ Get =
         innerHTML: "<span id=fT#{postID} class=fileText>File: <a href='#{data.media_link or data.remote_media_link}' target=_blank>#{data.media_orig}</a>-(#{if spoiler then 'Spoiler Image, ' else ''}#{filesize}, #{data.media_w}x#{data.media_h}, <span title></span>)</span>"
       span = $ 'span[title]', file
       span.title = filename
-      threshold = if isOP then 40 else 30
-      span.textContent =
-        # FILENAME SHORTENING SCIENCE:
-        # OPs have a +10 characters threshold.
-        # The file extension is not taken into account.
-        if filename.replace(/\.\w+$/, '').length > threshold
-          "#{filename[...threshold - 5]}(...)#{filename.match(/\.\w+$/)}"
-        else
-          filename
+      span.textContent = $.shortenFilename filename, isOP
       thumb_src = if data.media_status is 'available' then "src=#{data.thumb_link}" else ''
       $.add file, $.el 'a',
         className: if spoiler then 'fileThumb imgspoiler' else 'fileThumb'