let pass events of a progress dialog in event filter of WaitCursor

src/Gui/WaitCursor.cpp

@@ -27,6 +27,7 @@
 # include <QApplication>
 # include <QDateTime>
 # include <QMessageBox>
+# include <QProgressDialog>
 # ifdef FC_OS_WIN32
 #   include <windows.h>
 # endif
@@ -115,6 +116,9 @@ bool WaitCursorP::isModalDialog(QObject* o) const
         QMessageBox* dlg = qobject_cast<QMessageBox*>(parent);
         if (dlg && dlg->isModal())
             return true;
+        QProgressDialog* pd = qobject_cast<QProgressDialog*>(parent);
+        if (pd)
+            return true;
         parent = parent->parentWidget();
     }