+ allow to set a default action for an exclusive group

src/Gui/Action.cpp

@@ -266,6 +266,11 @@ void ActionGroup::setExclusive (bool b)
     _group->setExclusive(b);
 }
 
+bool ActionGroup::isExclusive() const
+{
+    return _group->isExclusive();
+}
+
 void ActionGroup::setVisible( bool b )
 {
     Action::setVisible(b);

src/Gui/Action.h

@@ -100,6 +100,7 @@ public:
     void setEnabled (bool);
     void setDisabled (bool);
     void setExclusive (bool);
+    bool isExclusive() const;
     void setVisible (bool);
 
     void setDropDownMenu(bool b) { _dropDown = b; }

src/Gui/Command.cpp

@@ -1151,6 +1151,19 @@ Action * PythonGroupCommand::createAction(void)
             Py::Int def(call2.apply(args));
             defaultId = static_cast<int>(def);
         }
+
+        // if the command is 'exclusive' then activate the default action
+        if (pcAction->isExclusive()) {
+            QList<QAction*> a = pcAction->actions();
+            if (defaultId >= 0 && defaultId < a.size()) {
+                QAction* qtAction = a[defaultId];
+                if (qtAction->isCheckable()) {
+                    qtAction->blockSignals(true);
+                    qtAction->setChecked(true);
+                    qtAction->blockSignals(false);
+                }
+            }
+        }
     }
     catch(Py::Exception&) {
         Base::PyGILStateLocker lock;