separate file for editor in edit view

app/views/exercises/_ace.html.slim

@@ -1,5 +1,4 @@
-#editor.panel-group.row data-exercise-id=@exercise.id
-  #files data-entries=FileTree.new(@files).to_js_tree
+#editor-edit.panel-group.row data-exercise-id=@exercise.id
   #frames
     .frame data-executable=file.file_type.executable? data-filename=file.name_with_extension data-renderable=file.file_type.renderable? data-role=file.role data-binary=file.file_type.binary? data-context-type=file.context_type
       .editor-content.hidden data-file-id=file.ancestor_id = file.content

app/views/exercises/_form.html.slim

@@ -9,7 +9,6 @@
   .form-group
     = f.label(:description)
     = f.pagedown_editor :description
-
   .form-group
     = f.label(:execution_environment_id)
     = f.collection_select(:execution_environment_id, @execution_environments, :id, :name, {}, class: 'form-control')
@@ -31,19 +30,12 @@
       = t('activerecord.attributes.exercise.allow_file_creation')
   h2 = t('activerecord.attributes.exercise.files')
 
-  /hidden editor -> to be deleted
-  .hide = render('ace', exercise: @exercise, file: @files.first)
-  /after use $('.frame').show() in js console everything works fine, probably editors are hidden somewhere in editor.js because we get "display:none" on frames
-
   ul#files.list-unstyled.panel-group
     = @exercise.files.each do |file|
       = render partial: 'file_form', locals: { file: file }
-    /= f.fields_for :files do |files_form|
-    /  = render('file_form', f: files_form, file: files_form.object, code: @files)
 
   a#add-file.btn.btn-default.btn-sm.pull-right href='#' = t('.add_file')
+
   ul#dummies.hidden
-    // = f.fields_for(:files, CodeOcean::File.new, child_index: 'index') do |files_form|
     = render partial: 'file_form', locals: { file: CodeOcean::File.new }
-    //= render('file_form', f: files_form, file: nil)
   .actions = render('shared/submit_button', f: f, object: @exercise)