Support RM 5.1

init.rb

@@ -1,7 +1,7 @@
 require 'redmine'
 
-require_dependency 'patches/attachments_patch'
-require_dependency 'hooks/view_layouts_base_html_head_hook'
+require_relative 'lib/redmine_lightbox2/patches/attachments_patch'
+require_relative 'lib/redmine_lightbox2/hooks/view_layouts_base_html_head_hook'
 
 Redmine::Plugin.register :redmine_lightbox2 do
   name 'Redmine Lightbox 2'

lib/redmine_lightbox2/patches/attachments_patch.rb

@@ -0,0 +1,23 @@
+require_dependency 'attachment'
+module RedmineLightbox2
+  module Patches
+    module AttachmentsPatch
+      def self.included(base) # :nodoc:
+        base.class_eval do
+          unloadable # Send unloadable so it will not be unloaded in development
+
+          def download_inline
+            # apply before_filters
+            find_attachment
+            file_readable
+            read_authorize
+
+            send_file @attachment.diskfile, :filename => filename_for_content_disposition(@attachment.filename),
+                      :type => detect_content_type(@attachment),
+                      :disposition => 'inline'
+          end
+        end
+      end
+    end
+  end
+end