Fix another action manager related wrong use of QFlags.

src/libs/utils/proxyaction.cpp

@@ -93,11 +93,13 @@ QAction *ProxyAction::action() const
 void ProxyAction::setAttribute(ProxyAction::Attribute attribute)
 {
     m_attributes |= attribute;
+    updateState();
 }
 
 void ProxyAction::removeAttribute(ProxyAction::Attribute attribute)
 {
     m_attributes &= ~attribute;
+    updateState();
 }
 
 bool ProxyAction::hasAttribute(ProxyAction::Attribute attribute)

src/libs/utils/proxyaction.h

@@ -46,9 +46,9 @@ class QTCREATOR_UTILS_EXPORT ProxyAction : public QAction
     Q_OBJECT
 public:
     enum Attribute {
-        Hide,
-        UpdateText,
-        UpdateIcon
+        Hide = 0x01,
+        UpdateText = 0x02,
+        UpdateIcon = 0x04
     };
     Q_DECLARE_FLAGS(Attributes, Attribute)