Fix Flag Warnings

MainWindow.cpp

@@ -433,8 +433,8 @@ void MainWindow::on_actionExploreENIGMA_triggered() { QDesktopServices::openUrl(
 
 void MainWindow::on_actionAbout_triggered() {
   QMessageBox aboutBox(QMessageBox::Information, tr("About"),
-                       tr("ENIGMA is a free, open-source, and cross-platform game engine."), QMessageBox::Ok, this,
-                       nullptr);
+                       tr("ENIGMA is a free, open-source, and cross-platform game engine."),
+                       QMessageBox::Ok, this);
   QAbstractButton *aboutQtButton = aboutBox.addButton(tr("About Qt"), QMessageBox::HelpRole);
   aboutBox.exec();
 

Models/MessageModel.cpp

@@ -179,7 +179,7 @@ QModelIndex MessageModel::index(int row, int column, const QModelIndex & /*paren
 }
 
 Qt::ItemFlags MessageModel::flags(const QModelIndex &index) const {
-  if (!index.isValid()) return nullptr;
+  if (!index.isValid()) return Qt::NoItemFlags;
   auto flags = QAbstractItemModel::flags(index);
   // Row 0 isn't a valid field in messages. We use it as header data
   if (index.row() > 0) flags |= Qt::ItemIsEditable;

Models/ProtoModel.cpp

@@ -34,7 +34,7 @@ bool ProtoModel::IsDirty() { return _dirty; }
 QModelIndex ProtoModel::parent(const QModelIndex & /*index*/) const { return QModelIndex(); }
 
 Qt::ItemFlags ProtoModel::flags(const QModelIndex &index) const {
-  if (!index.isValid()) return nullptr;
+  if (!index.isValid()) return Qt::NoItemFlags;
   auto flags = QAbstractItemModel::flags(index);
   flags |= Qt::ItemIsEditable;
   return flags;