fix #2012

app/helpers/note_versions_helper.rb

@@ -0,0 +1,30 @@
+module NoteVersionsHelper
+  def note_version_body_diff_info(note_version)
+    previous = note_version.previous
+    if previous.nil?
+      return ""
+    end
+
+    html = ""
+    if note_version.body == previous.body
+      html += '<span class="inactive">(body not changed)</span>'
+    end
+
+    html.html_safe
+  end
+
+  def note_version_position_diff(note_version)
+    previous = note_version.previous
+
+    html = "#{note_version.width}x#{note_version.height}"
+    html += " #{note_version.x},#{note_version.y}"
+    if previous.nil?
+      html
+    elsif note_version.x == previous.x && note_version.y == previous.y && note_version.width == previous.width && note_version.height == previous.height
+      html
+    else
+      html = '<span style="text-decoration: underline;">' + html + '</span>'
+      html.html_safe
+    end
+  end
+end