Gui: Implement PythonWrapper::fromQAction

Wrapping QAction through QObject does not work as QAction class
is a part of QtGui not QtCore, so Py::Object with internal
pointer being null is returned causing a crash later.
Therefore implement fromQAction conversion method.

src/Gui/CommandActionPy.cpp

@@ -59,7 +59,7 @@ Py::Object CommandActionPy::getAction()
         PythonWrapper wrap;
         wrap.loadWidgetsModule();
 
-        return wrap.fromQObject(action->action());
+        return wrap.fromQAction(action->action());
     }
     else {
         return Py::None();

src/Gui/CommandPyImp.cpp

@@ -274,10 +274,10 @@ PyObject* CommandPy::getAction(PyObject *args)
         if (group) {
             const auto actions = group->actions();
             for (auto a : actions)
-                list.append(wrap.fromQObject(a));
+                list.append(wrap.fromQAction(a));
         }
         else if (action) {
-            list.append(wrap.fromQObject(action->action()));
+            list.append(wrap.fromQAction(action->action()));
         }
 
         return Py::new_reference_to(list);

src/Gui/PythonWrapper.cpp

@@ -25,6 +25,7 @@
 # include <limits>
 # include <unordered_map>
 # include <list>
+# include <QAction>
 # include <QApplication>
 # include <QDir>
 # include <QIcon>
@@ -635,6 +636,28 @@ QDir* PythonWrapper::toQDir(PyObject* pyobj)
     return qt_getCppType<QDir>(pyobj);
 }
 
+Py::Object PythonWrapper::fromQAction(QAction* action)
+{
+#if defined (HAVE_SHIBOKEN) && defined(HAVE_PYSIDE)
+    // Access shiboken/PySide via C++
+    auto type = getPyTypeObjectForTypeName<QAction>();
+    if (type) {
+        PyObject* pyobj = Shiboken::Object::newObject(type, action, false, false, "QAction");
+        WrapperManager::instance().addQObject(action, pyobj);
+        return Py::asObject(pyobj);
+    }
+    throw Py::RuntimeError("Failed to wrap action");
+#else
+    // Access shiboken/PySide via Python
+# if QT_VERSION < QT_VERSION_CHECK(6,0,0)
+    constexpr const char* qtModWithQAction = "QtWidgets";
+# else
+    constexpr const char* qtModWithQAction = "QtGui";
+# endif
+    return qt_wrapInstance<QAction*>(action, "QAction", qtModWithQAction);
+#endif
+}
+
 Py::Object PythonWrapper::fromQPrinter(QPrinter* printer)
 {
     if (!printer) {

src/Gui/PythonWrapper.h

@@ -29,6 +29,7 @@
 #include <FCGlobal.h>
 
 QT_BEGIN_NAMESPACE
+class QAction;
 class QDir;
 class QIcon;
 class QImage;
@@ -58,6 +59,7 @@ public:
     QGraphicsObject* toQGraphicsObject(PyObject* pyPtr);
     QGraphicsObject* toQGraphicsObject(const Py::Object& pyObject);
 
+    Py::Object fromQAction(QAction*);
     Py::Object fromQPrinter(QPrinter*);
     Py::Object fromQObject(QObject*, const char* className=nullptr);
     Py::Object fromQWidget(QWidget*, const char* className=nullptr);