lambda rm unused capture

GUI/View/Main/ActionManager.cpp

@@ -151,8 +151,8 @@ void ActionManager::createMenus()
         auto* l = new QHBoxLayout(w);
         l->addWidget(new QLabel("2D plot color scheme"));
         QComboBox* box =
-            GUI::Util::createComboBox([this] { return *gApp->color_gradient_combo; },
-                                      [this](const QString& s) {
+            GUI::Util::createComboBox([] { return *gApp->color_gradient_combo; },
+                                      [](const QString& s) {
                                           gApp->color_gradient_combo->setCurrentValue(s);
                                           emit gApp->gradientChanged();
                                       },