#40 checking which mentions failed [buggy]

* flash message does not work

lib/redmine_mentions/journal_patch.rb

@@ -3,7 +3,7 @@ module JournalPatch
     def self.included(base)
       base.class_eval do
         after_create :send_mail
-        
+
         def send_mail
           if self.journalized.is_a?(Issue) && self.notes.present?
             issue = self.journalized
@@ -12,13 +12,22 @@ def send_mail
             users_regex=users.collect{|u| "#{Setting.plugin_redmine_mentions['trigger']}#{u.login}"}.join('|')
             regex_for_email = '\B('+users_regex+')\b'
             regex = Regexp.new(regex_for_email)
+
             mentioned_users = self.notes.scan(regex)
             mentioned_users.each do |mentioned_user|
               username = mentioned_user.first[1..-1]
               if user = User.find_by_login(username)
                 MentionMailer.notify_mentioning(issue, self, user).deliver
               end
             end
+
+            all_mentions = self.notes.scan(Regexp.new("(#{Setting.plugin_redmine_mentions['trigger']}\\w+)"))
+            not_notified = all_mentions - mentioned_users
+
+            if !flash[:notice].blank? && not_notified.any?
+              flash[:notice] += content_tag(:p, l(:label_issue_notice_recipients) + not_notified.join('; '), :class => 'email-was-not-sent')
+              flash[:notice] = flash[:notice].html_safe
+            end
           end
         end
       end