Do not clear issue relations when moving an issue to another project if...

Do not clear issue relations when moving an issue to another project if cross-project issue relations are allowed (closes #696).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1164 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -66,8 +66,10 @@ class Issue < ActiveRecord::Base
     transaction do
       if new_project && project_id != new_project.id
         # delete issue relations
-        self.relations_from.clear
-        self.relations_to.clear
+        unless Setting.cross_project_issue_relations?
+          self.relations_from.clear
+          self.relations_to.clear
+        end
         # issue is moved to another project
         self.category = nil 
         self.fixed_version = nil