缺陷描述修改后查看细节页面导航栏丢失，原因：为添加layout，解决：加上layout

app/controllers/journals_controller.rb

@@ -54,6 +54,11 @@ class JournalsController < ApplicationController
     end
     (render_404; return false) unless @issue && @detail
     @diff = Redmine::Helpers::Diff.new(@detail.value, @detail.old_value)
+    respond_to do |format|
+      format.html {
+        render :layout => 'project_base'
+      }
+    end
   end
 
   def new