How to load a map in QT GUI application using text file

[FelixB]

can you explain (in own words!) what happens in this snippet?

while (!in.atEnd())
{
  line = in.readLine();
  ui->textBrowser->setText(line);
}

while (!in.atEnd())
{
  line = in.readLine();
  ui->textBrowser->setText(line);
}

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