Do the same in PartitionBarsView.

src/modules/partition/gui/PartitionBarsView.cpp

@@ -477,6 +477,17 @@ PartitionBarsView::leaveEvent( QEvent* event )
 }
 
 
+void
+PartitionBarsView::mousePressEvent( QMouseEvent* event )
+{
+    QModelIndex candidateIndex = indexAt( event->pos() );
+    if ( canBeSelected( candidateIndex ) )
+        QAbstractItemView::mousePressEvent( event );
+    else
+        event->accept();
+}
+
+
 void
 PartitionBarsView::updateGeometries()
 {

src/modules/partition/gui/PartitionBarsView.h

@@ -64,6 +64,7 @@ protected:
 
     void mouseMoveEvent( QMouseEvent* event ) override;
     void leaveEvent( QEvent* event ) override;
+    void mousePressEvent( QMouseEvent* event ) override;
 
 protected slots:
     void updateGeometries() override;