QCompleter breaking use of keyboard accents

#include <QMainWindow>
#include "mainwindow.h"
#include "completer.h"

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui_(new Ui_MainWindow) {

  ui_->setupUi(this);

  show();
  Completer *completer = new Completer();
  ui_->lineedit->setCompleter(completer);

}

MainWindow::~MainWindow() { delete ui_; }


#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "ui_mainwindow.h"

class MainWindow : public QMainWindow {
  Q_OBJECT

 public:
  explicit MainWindow(QWidget *parent = nullptr);
  ~MainWindow();

 private:
  Ui_MainWindow *ui_;

};

#endif // MAINWINDOW_H

#include <QCompleter>
#include "completer.h"

Completer::Completer() {
  setModel(new CompleterModel());
  setCaseSensitivity(Qt::CaseInsensitive);
}

Completer::~Completer() {}

CompleterModel::CompleterModel() {
  setStringList(QStringList() << "Test1" << "Test2");
}

CompleterModel::~CompleterModel() {}

#ifndef COMPLETER_H
#define COMPLETER_H

#include <QCompleter>
#include <QStringListModel>

class Completer : public QCompleter {
  Q_OBJECT

 public:
  explicit Completer();
  ~Completer();

 private:

};

class CompleterModel : public QStringListModel {
  Q_OBJECT

 public:
  explicit CompleterModel();
  ~CompleterModel();

 private:

};

#endif // COMPLETER_H