Make it run with Qt6

This is a huge commit. Changes:
* Obviously, make it compile
* Make it run (only scarcely tested)
* get rid of most of clang's warnings

Let's see what surprises are in store...

1 files changed, 3 insertions, 3 deletions

diff --git a/mappingtreewidget.cpp b/mappingtreewidget.cpp
index 6c6a495..7fd8071 100644
--- a/mappingtreewidget.cpp
+++ b/mappingtreewidget.cpp
@@ -106,7 +106,7 @@ MappingTreeWidget::MappingTreeWidget(QWidget *parent) : QWidget(parent){
 
     //setup actions
     QAction *addActorA = new QAction(QIcon(":/fire.png"), tr("Add actor..."), this);
-    addActorA->setShortcut(Qt::CTRL + Qt::Key_A);
+    addActorA->setShortcut(Qt::CTRL | Qt::Key_A);
     connect(addActorA, &QAction::triggered, this, &MappingTreeWidget::addActor);
     mTree->addAction(addActorA);
     mTree->addAction(Helper::createSeparator(this));
@@ -243,7 +243,7 @@ void MappingTreeWidget::deleteChild(){
     QModelIndex sel = selected();
     QModelIndex real = mProxy->mapToSource(sel);
     if(mModel->rowCount(real) > 0){
-        QString msg = QString(tr("Cannot delete item %1, because it has %2 children!")).arg(real.data().toString()).arg(QString::number(mModel->rowCount(real)));
+        QString msg = QString(tr("Cannot delete item %1, because it has %2 children!")).arg(real.data().toString(), QString::number(mModel->rowCount(real)));
         QMessageBox::critical(this, tr("Error"), msg);
         return;
     }
@@ -252,7 +252,7 @@ void MappingTreeWidget::deleteChild(){
     if(retval == QMessageBox::Yes){
         if(!mModel->deleteChild(real)){
             QSqlError last = mModel->lastError();
-            QString msg = QString(tr("Failed to delete %1. Database said: %2")).arg(real.data().toString()).arg(last.text());
+            QString msg = QString(tr("Failed to delete %1. Database said: %2")).arg(real.data().toString(), last.text());
             QMessageBox::critical(this, tr("Error"), msg);
         }
     }