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QFont font;
const int tabStop = 4; // 4 characters
QFontMetrics metrics(font);
ui->textEdit->setTabStopWidth(tabStop * metrics.width(' '));
QFont font;
font.setFamily("Courier");
font.setStyleHint(QFont::Monospace);
font.setFixedPitch(true);
font.setPointSize(10);
QTextEdit* editor = new QTextEdit();
editor->setFont(font);
const int tabStop = 4; // 4 characters
QFontMetrics metrics(font);
editor->setTabStopWidth(tabStop * metrics.width(' '));