According to the documentation QStyle::PM_TextCursorWidth is supposed to report the width of the text cursor in QLineEdit and QTextEdit widgets.

It appears to report the width of a normal cursor, even when you set an input mask. When an input mask is set, the cursor grows wider. On my system it's 5 pixels instead of 1.

Repro:

1. Place the below code in another widget, e.g. QMainWindow
2. Run program
3. Observe cursor is wider than usual, even when the cursor is at EOL
4. Observe "1" in the debug output

   QLineEdit* line_edit = new QLineEdit;
   layout()->addWidget(line_edit);
   line_edit->setInputMask("HHHHHHHH");
   QStyleOption option;
   option.initFrom(line_edit);
   qDebug() << line_edit->style()->pixelMetric(QStyle::PM_TextCursorWidth, &option, line_edit);