# HG changeset patch
# User Chris Cannam
# Date 1488214367 0
# Node ID cce97b00663a5a6536e0d927e31b04dbece9f609
# Parent  d122d3595a328054600f8ac5e78a0b34fff73af4
Write aggregate models to .sv file when saving document. They still are not reloaded, but I think this is far as I'm prepared to go for 3.0.

diff -r d122d3595a32 -r cce97b00663a framework/Document.cpp
--- a/framework/Document.cpp	Mon Feb 27 16:26:37 2017 +0000
+++ b/framework/Document.cpp	Mon Feb 27 16:52:47 2017 +0000
@@ -1290,11 +1290,38 @@
     for (LayerViewMap::const_iterator i = m_layerViewMap.begin();
          i != m_layerViewMap.end(); ++i) {
 
-        if (i->first && !i->second.empty() && i->first->getModel()) {
-            used.insert(i->first->getModel());
+        if (i->first && !i->second.empty()) { // Layer exists, is in views
+            Model *m = i->first->getModel();
+            if (m) {
+                used.insert(m);
+                if (m->getSourceModel()) {
+                    used.insert(m->getSourceModel());
+                }
+            }
         }
     }
 
+    // Write aggregate models first, so that when re-reading
+    // derivations we already know about their existence. But only
+    // those that are actually used
+
+    for (std::set<Model *>::iterator i = m_aggregateModels.begin();
+         i != m_aggregateModels.end(); ++i) {
+
+        SVDEBUG << "checking aggregate model " << *i << endl;
+        
+        AggregateWaveModel *aggregate = qobject_cast<AggregateWaveModel *>(*i);
+        if (!aggregate) continue; 
+        if (used.find(aggregate) == used.end()) {
+            SVDEBUG << "(unused, skipping)" << endl;
+            continue;
+        }
+
+        SVDEBUG << "(used, writing)" << endl;
+
+        aggregate->toXml(out, indent + "  ");
+    }
+
     std::set<Model *> written;
 
     for (ModelMap::const_iterator i = m_models.begin();
@@ -1353,7 +1380,7 @@
                  .arg(XmlExportable::getObjectExportId(model)));
         }
     }
-	    
+    
     //!!!
 
     // We should write out the alignment models here.  AlignmentModel