Fix long hang when selecting huge number of vertices with node tool

Author: nyalldawson

src/app/nodetool/qgsmaptoolnodetool.cpp

@@ -516,14 +516,16 @@ void QgsMapToolNodeTool::canvasReleaseEvent( QgsMapMouseEvent* e )
         mSelectedFeature->deselectAllVertexes();
       }
 
+      QVector< int > toSelect;
       for ( int i = 0; i < vertexMap.size(); i++ )
       {
-        if ( r.contains( vertexMap[i]->pointV1() ) )
+        if ( r.contains( vertexMap.at( i )->pointV1() ) )
         {
-          // inverting selection is enough because all were deselected if ctrl is not pressed
-          mSelectedFeature->invertVertexSelection( i );
+          toSelect << i;
         }
       }
+      // inverting selection is enough because all were deselected if ctrl is not pressed
+      mSelectedFeature->invertVertexSelection( toSelect );
     }
   }
 

src/app/nodetool/qgsselectedfeature.cpp

@@ -482,6 +482,19 @@ void QgsSelectedFeature::invertVertexSelection( int vertexNr )
   emit selectionChanged();
 }
 
+void QgsSelectedFeature::invertVertexSelection( QVector<int> vertexIndices )
+{
+  Q_FOREACH ( int index, vertexIndices )
+  {
+    if ( index < 0 || index >= mVertexMap.size() )
+      continue;
+
+    QgsVertexEntry *entry = mVertexMap.at( index );
+    entry->setSelected( !entry->isSelected() );
+  }
+  emit selectionChanged();
+}
+
 void QgsSelectedFeature::updateVertexMarkersPosition()
 {
   Q_FOREACH ( QgsVertexEntry* vertexEntry, mVertexMap )

src/app/nodetool/qgsselectedfeature.h

@@ -85,10 +85,15 @@ class QgsSelectedFeature: public QObject
     /**
      * Inverts selection of vertex with number
      * @param vertexNr number of vertex which is to be inverted
-     * @param invert flag if vertex selection should be inverted or not
      */
     void invertVertexSelection( int vertexNr );
 
+    /**
+     * Inverts selection of a set of vertices at once.
+     * @param vertexIndices list of vertex indices to invert whether or not they are selected
+     */
+    void invertVertexSelection(QVector<int> vertexIndices );
+
     /**
      * Tells if vertex is selected
      * @param vertexNr number of vertex for which we are getting info