Method PopState

libraries/lib-project-history/ProjectHistory.cpp:106–118

LL: Is there a memory leak here as "l" and "t" are not deleted??? Vaughan, 2010-08-29: No, as "l" is a TrackList* of an Undo stack state. Need to keep it and its tracks "t" available for Undo/Redo/SetStateTo.

// Vaughan, 2010-08-29: No, as "l" is a TrackList* of an Undo stack state.
//    Need to keep it and its tracks "t" available for Undo/Redo/SetStateTo.
void ProjectHistory::PopState(const UndoState &state, bool doAutosave)
{
   auto &project = mProject;
   if (doAutosave)
      AutoSave::Call(project);

   // remaining no-fail operations "commit" the changes of undo manager state

   // Restore extra state
   for (auto &pExtension : state.extensions)
      if (pExtension)
         pExtension->RestoreUndoRedoState(project);
}

void ProjectHistory::SetStateTo(int n, bool doAutosave)
{