diff --git a/sources/diagram.cpp b/sources/diagram.cpp
index 3bb984338..f7c336ed6 100644
--- a/sources/diagram.cpp
+++ b/sources/diagram.cpp
@@ -2279,6 +2279,7 @@ void Diagram::setItemGroup(QGraphicsItem *item, const QUuid &group)
 	if (m_project) {
 		m_project->dataBase()->itemGroupChanged(item);
 	}
+	emit itemGroupChanged();
 }
 
 /**
diff --git a/sources/diagram.h b/sources/diagram.h
index 96299d036..ff7ff1f9b 100644
--- a/sources/diagram.h
+++ b/sources/diagram.h
@@ -325,6 +325,10 @@ class Diagram : public QGraphicsScene
 
 		void diagramActivated();
 		void diagramInformationChanged();
+
+			/// Emitted by setItemGroup(): an item joined or left a group
+			/// without the selection changing (#1144)
+		void itemGroupChanged();
 };
 Q_DECLARE_METATYPE(Diagram *)
 
diff --git a/sources/qetdiagrameditor.cpp b/sources/qetdiagrameditor.cpp
index e28927dcd..46cec2c5d 100644
--- a/sources/qetdiagrameditor.cpp
+++ b/sources/qetdiagrameditor.cpp
@@ -3185,6 +3185,12 @@ void QETDiagramEditor::diagramWasAdded(DiagramView *dv)
 		this,
 		&QETDiagramEditor::selectionChanged,
 		Qt::DirectConnection);
+		//Grouping leaves the selection as it is, so without this Group
+		//and Ungroup would keep the state from before (#1144)
+	connect(dv->diagram(),
+		&Diagram::itemGroupChanged,
+		this,
+		&QETDiagramEditor::slot_updateComplexActions);
 	connect(dv, &DiagramView::modeChanged, this, &QETDiagramEditor::slot_updateModeActions);
 	connect(dv, &DiagramView::elementPlacementStarted, this, &QETDiagramEditor::rememberPlacedElement);
 }