Added antialiasing

comdel/display/component_display.cpp

@@ -95,7 +95,7 @@ namespace display {
                     }
                 }
             }
-        } else {
+        } else if(!pinConnections.empty()) {
             auto pinConnection = pinConnections[0];
             if(auto busConnection = dynamic_cast<domain::BusConnectionInstance*>(pinConnection)) {
                 menu.addSection(QString::fromStdString(busConnection->bus->name));

comdel/display/schema_display.cpp

@@ -13,6 +13,8 @@ namespace display {
     Schema::Schema() {
         schema = nullptr;
         library = std::nullopt;
+        setRenderHint(QPainter::Antialiasing);
+        setAlignment(Qt::AlignCenter);
         this->setScene(&scene);
         this->setAcceptDrops(true);
     }