[client] bugfix: property signal wasn't linked to receiver lifetime

client/src/widget/propertypairoutputaction.cpp

@@ -41,7 +41,7 @@ PropertyPairOutputAction::PropertyPairOutputAction(Property& property, QWidget*
     {
       update(rect());
     });
-  connect(&m_property, &Property::attributeChanged,
+  connect(&m_property, &Property::attributeChanged, this,
     [this](AttributeName name, const QVariant& value)
     {
       switch(name)

client/src/widget/propertyspinbox.cpp

@@ -83,7 +83,7 @@ PropertySpinBox::PropertySpinBox(Property& property, QWidget* parent) :
           break;
       }
     });
-  connect(this, QOverload<int>::of(&PropertySpinBox::valueChanged),
+  connect(this, QOverload<int>::of(&PropertySpinBox::valueChanged), this,
     [this](int value)
     {
       cancelRequest();