1 files changed, 15 insertions, 2 deletions

diff --git a/korganizer/koagendaview.cpp b/korganizer/koagendaview.cpp
index 13d8398..4ff6899 100644
--- a/korganizer/koagendaview.cpp
+++ b/korganizer/koagendaview.cpp
@@ -999,7 +999,20 @@ void KOAgendaView::updateEventDates(KOAgendaItem *item, int type)
         item->incidence()->setDtStart(startDt);
         (static_cast<Event*>(item->incidence()))->setDtEnd(endDt);
     } else if ( item->incidence()->type() == "Todo" ) {
-        (static_cast<Todo*>(item->incidence()))->setDtDue(endDt);
+        Todo* to = static_cast<Todo*>(item->incidence());
+
+        int len  = 0;
+        if ( to->hasStartDate() &&  to->hasDueDate() )
+            len = to->dtStart().secsTo( to->dtDue());
+        to->setDtDue(endDt);
+        if ( to->hasStartDate() ) {
+            if ( len>0 ) 
+                to->setDtStart(to->dtDue().addSecs( -len ));
+            else
+                if (to->dtStart() > to->dtDue() )
+                    to->setDtStart(to->dtDue().addDays( -3 ));
+        }
+        
     }
     //qDebug("KOAgendaView::updateEventDates stsart %s end %s ", startDt.toString().latin1(), endDt.toString().latin1() );
     item->incidence()->setRevision(item->incidence()->revision()+1);
@@ -1180,7 +1193,7 @@ void KOAgendaView::fillAgenda()
             Todo *todo = todos.at(numTodo);
 
             if ( ! todo->hasDueDate() && !todo->hasCompletedDate()) continue;  // todo shall not be displayed if it has no date
-
+           
             // ToDo items shall be displayed for the day they are due, but only showed today if they are already overdue.
             // Already completed items can be displayed on their original due date
             //if not KOPrefs::instance()->mShowTodoInAgenda, show overdue in agenda