Use only one editor to reduce complexity

app/views/exercises/external_users/statistics.html.slim

@@ -10,16 +10,13 @@ h1 = "#{@exercise} (external user #{@external_user})"
 
   .hidden#data data-submissions=ActiveSupport::JSON.encode(submissions) data-files=ActiveSupport::JSON.encode(all_files)
 
-  - index = 0
-  - all_files.each do |files|
-    #stats-editor.row
+  #stats-editor.row
+    - index = 0
+    - all_files.each do |files|
       .files class=(@exercise.hide_file_tree ? 'hidden col-sm-3' : 'col-sm-3') data-index=index data-entries=FileTree.new(files).to_js_tree
-      .frames class=(@exercise.hide_file_tree ? 'col-sm-12' : 'col-sm-9')
-        - files.each do |file|
-          .frame-container
-            = render('editor_frame', exercise: @exercise, file: file)
-            .hidden.data data-file-id=file.id
-    - index += 1
+      - index += 1
+    div class=(@exercise.hide_file_tree ? 'col-sm-12' : 'col-sm-9')
+      #current-file.editor style="height: 400px"
 
   #slider
     input type='range' orient='horizontal' list='datapoints' min=0 max=submissions.length-1 value=0