only select nodes on right click if the current clicked node isn't already selected

app/widget/nodeview/nodeview.cpp

@@ -347,15 +347,18 @@ void NodeView::mousePressEvent(QMouseEvent *event)
   if (HandPress(event)) return;
 
   if (event->button() == Qt::RightButton) {
-    // Qt doesn't do this by default for some reason
-    if (!(event->modifiers() & Qt::ShiftModifier)) {
-      scene_.clearSelection();
-    }
-
-    // If there's an item here, select it
     QGraphicsItem* item = itemAt(event->pos());
-    if (item) {
-      item->setSelected(true);
+
+    if (!item || !item->isSelected()) {
+      // Qt doesn't do this by default for some reason
+      if (!(event->modifiers() & Qt::ShiftModifier)) {
+        scene_.clearSelection();
+      }
+
+      // If there's an item here, select it
+      if (item) {
+        item->setSelected(true);
+      }
     }
   }