Bug Fix - recurrence

- Fixed bug whereby handleRecurrence was being called after the tasks
  were loaded and filtered, and thus handleRecurrence operated on a
  filtered set, and failed.  The fix is to move the call to before the
  TDB::load call, and to add another TDB::loadPending call inside
  handleRecurrence.  This means TDB::load needs to be reentrant without
  re-reading the file, and can therefore be called twice, with the
  likelihood of there being a different filter for each call.  This in
  turn led to the problem whereby handleRecurrence would generate the
  synthetic tasks, which then sat uncommitted in TDB::mNew.  The fix
  for this is that every call to TDB::loadPending gets the contents of
  TDB::mNew appended (with correct IDs).  This bug is what you might
  call a good one.

src/edit.cpp

@@ -490,8 +490,8 @@ std::string handleEdit ()
 
   std::vector <Task> tasks;
   context.tdb.lock (context.config.get ("locking", true));
+  handleRecurrence ();
   context.tdb.loadPending (tasks, context.filter);
-  handleRecurrence (tasks);
 
   // Filter sequence.
   context.filter.applySequence (tasks, context.sequence);