Line wrapping in QTextEdit does not work for white spaces

If you have a line like this:

cursor.insertText(QString().fill(' ', 100)+"?", format);

with the following wrap properties set:

textEdit->setWordWrapMode(QTextOption::WrapAnywhere);
textEdit->setLineWrapMode(QTextEdit::FixedColumnWidth);
textEdit->setLineWrapColumnOrWidth(10);

The whitespaces are printed 100 in a row, ignoring the column/width of 10.