Add missing parent for messagebox and other popups

Unparented popups can easily get lost in backround, but they still block top level event loop when run with ::exec() thus preventing interactions with main window.  This mainly happens on wayland. Setting the parent ensures they are always kept on top and reasonably positioned.

src/Mod/PartDesign/Gui/ViewProviderPrimitive.cpp

@@ -30,6 +30,7 @@
 #include <Gui/BitmapFactory.h>
 #include <Gui/Command.h>
 #include <Gui/Control.h>
+#include <Gui/MainWindow.h>
 #include <Gui/TaskView/TaskDialog.h>
 #include <Mod/PartDesign/App/FeaturePrimitive.h>
 
@@ -64,7 +65,7 @@ bool ViewProviderPrimitive::setEdit(int ModNum)
         Gui::TaskView::TaskDialog *dlg = Gui::Control().activeDialog();
         TaskPrimitiveParameters *primitiveDlg = qobject_cast<TaskPrimitiveParameters *>(dlg);
         if (dlg && !primitiveDlg) {
-            QMessageBox msgBox;
+            QMessageBox msgBox(Gui::getMainWindow());
             msgBox.setText(QObject::tr("A dialog is already open in the task panel"));
             msgBox.setInformativeText(QObject::tr("Do you want to close this dialog?"));
             msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);