Makes subtasks rescheduled when a 'precedes' relation is set on a parent task.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3574 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -431,7 +431,24 @@ class Issue < ActiveRecord::Base
   end
   
   def soonest_start
-    @soonest_start ||= relations_to.collect{|relation| relation.successor_soonest_start}.compact.min
+    @soonest_start ||= (
+        relations_to.collect{|relation| relation.successor_soonest_start} +
+        ancestors.collect(&:soonest_start)
+      ).compact.max
+  end
+  
+  def reschedule_after(date)
+    return if date.nil?
+    if leaf?
+      if start_date.nil? || start_date < date
+        self.start_date, self.due_date = date, date + duration
+        save
+      end
+    else
+      leaves.each do |leaf|
+        leaf.reschedule_after(date)
+      end
+    end
   end
   
   def <=>(issue)

app/models/issue_relation.rb

@@ -73,9 +73,8 @@ class IssueRelation < ActiveRecord::Base
   
   def set_issue_to_dates
     soonest_start = self.successor_soonest_start
-    if soonest_start && (!issue_to.start_date || issue_to.start_date < soonest_start)
-      issue_to.start_date, issue_to.due_date = successor_soonest_start, successor_soonest_start + issue_to.duration
-      issue_to.save
+    if soonest_start
+      issue_to.reschedule_after(soonest_start)
     end
   end