Fixed some flaws in the layer list

- sometimes, layers which were supposed to be hidden were still shown
  (e.g. after paste, "add other layer views" etc.)
- sometimes, layers were only partially hightlighted due to invalid
  persistent model indexes.

src/laybasic/laybasic/layLayerControlPanel.cc

@@ -204,10 +204,10 @@ LayerControlPanel::LayerControlPanel (lay::LayoutView *view, db::Manager *manage
     mp_view (view), 
     m_needs_update (true), 
     m_tabs_need_update (true), 
+    m_hidden_flags_need_update (true),
     m_in_update (false),
     m_phase (0), 
     m_do_update_content_dm (this, &LayerControlPanel::do_update_content),
-    m_do_update_hidden_flags_dm (this, &LayerControlPanel::do_update_hidden_flags),
     m_no_stipples (false)
 {
   setObjectName (QString::fromUtf8 (name));
@@ -1661,7 +1661,8 @@ LayerControlPanel::set_text_color (QColor c)
 void
 LayerControlPanel::update_hidden_flags ()
 {
-  m_do_update_hidden_flags_dm ();
+  m_hidden_flags_need_update = true;
+  m_do_update_content_dm ();
 }
 
 void
@@ -1688,6 +1689,7 @@ LayerControlPanel::begin_updates ()
   if (! m_in_update) {
 
     m_in_update = true;
+    m_hidden_flags_need_update = true;
 
     mp_model->signal_begin_layer_changed ();  //  this makes the view redraw the data
 
@@ -1718,6 +1720,7 @@ LayerControlPanel::cancel_updates ()
 {
   m_in_update = false;
   m_needs_update = false;
+  m_hidden_flags_need_update = false;
   m_tabs_need_update = false;
 }
 
@@ -1833,7 +1836,7 @@ LayerControlPanel::do_update_content ()
     mp_layer_list->setCurrentIndex(QModelIndex());
 
     //  this makes the view redraw the data and establishes a valid selection scheme
-    mp_model->signal_layer_changed ();  
+    mp_model->signal_layers_changed ();
 
     //  now realize the selection if required
     if (! m_new_sel.empty ()) {
@@ -1875,6 +1878,14 @@ LayerControlPanel::do_update_content ()
   } else {
     mp_model->signal_data_changed ();  //  this makes the view redraw the data
   }
+
+  if (m_hidden_flags_need_update) {
+
+    do_update_hidden_flags ();
+
+    m_hidden_flags_need_update = false;
+
+  }
 }
 
 void
@@ -2007,7 +2018,7 @@ LayerControlPanel::update_required (int f)
   }
 
   if ((f & 3) != 0) {
-    m_do_update_hidden_flags_dm ();
+    m_hidden_flags_need_update = true;
   }
 
   m_do_update_content_dm ();

src/laybasic/laybasic/layLayerControlPanel.h

@@ -341,10 +341,11 @@ private:
   lay::LayoutView *mp_view;
   bool m_needs_update;
   bool m_tabs_need_update;
+  bool m_hidden_flags_need_update;
   bool m_in_update;
   std::vector<size_t> m_new_sel;
   int m_phase;
-  tl::DeferredMethod<LayerControlPanel> m_do_update_content_dm, m_do_update_hidden_flags_dm;
+  tl::DeferredMethod<LayerControlPanel> m_do_update_content_dm;
   std::set<unsigned int> m_expanded;
   bool m_no_stipples;
   QLabel *m_no_stipples_label;

src/laybasic/laybasic/layLayerTreeModel.cc

@@ -421,9 +421,9 @@ LayerTreeModel::signal_begin_layer_changed ()
 }
 
 void 
-LayerTreeModel::signal_layer_changed () 
+LayerTreeModel::signal_layers_changed ()
 {
-  // establish a new range of valid iterator indices
+  //  establish a new range of valid iterator indices
   m_id_start = m_id_end; 
 
   //  TODO: is there a more efficient way to compute that?
@@ -433,6 +433,21 @@ LayerTreeModel::signal_layer_changed ()
   }
   m_id_end += max_id + 1;
 
+  //  update the persistent indexes
+
+  QModelIndexList indexes = persistentIndexList ();
+  QModelIndexList new_indexes;
+  for (QModelIndexList::const_iterator i = indexes.begin (); i != indexes.end (); ++i) {
+    lay::LayerPropertiesConstIterator li = iterator (*i);
+    if (! li.at_end ()) {
+      new_indexes.push_back (createIndex (li.child_index (), i->column (), (void *) (li.uint () + m_id_start)));
+    } else {
+      new_indexes.push_back (QModelIndex ());
+    }
+  }
+
+  changePersistentIndexList (indexes, new_indexes);
+
   m_test_shapes_cache.clear ();
   emit layoutChanged ();
 }

src/laybasic/laybasic/layLayerTreeModel.h

@@ -235,11 +235,12 @@ public:
   /**
    *  @brief emit a layoutChanged signal
    */
-  void signal_layer_changed ();
+  void signal_layers_changed ();
 
 signals:
   /**
-   *  @brief This signal is emitted to indicate
+   *  @brief This signal is emitted to indicate the hidden flags need update by the client
+   *  Note this is neither done by the view nor the model. It needs to be implemented elsewhere.
    */
   void hidden_flags_need_update ();