Unable to handle Ctrl+Shift+.

#include <QApplication>
#include <QWidget>
#include <QLabel>
#include <QVBoxLayout>
#include <QtEvents>

class Widget : public QWidget {
public:
	Widget()
	: _layout(this) {
		_layout.addWidget(&_label);
	}
protected:
	void keyPressEvent(QKeyEvent *e) override {
		const auto modifiers = e->modifiers()
			& ~(Qt::KeypadModifier | Qt::GroupSwitchModifier);
		const auto matches = [&](const QKeySequence &sequence) {
			const auto events = QKeySequence(modifiers | e->key());
			return sequence.matches(events) == QKeySequence::ExactMatch;
		};
		if (matches(QKeySequence("ctrl+shift+."))) {
			_label.setText("ctrl+shift+.");
		}
	}

	void keyReleaseEvent(QKeyEvent *e) override {
		_label.setText({});
	}
private:
	QVBoxLayout _layout;
	QLabel _label;
};

int main(int argc, char *argv[]) {
	QApplication app(argc, argv);
	Widget widget;
	widget.show();
	return app.exec();
}