QTextEdit - margins, indents within QTextEdit

[Acamapichtli]

I want to have possibility of changing margins/indents in QTextEdit, without resizing QTextEdit.

What I mean is that when I use stylesheets:

textEdit->setStyleSheet("QTextEdit{margin-left: 30px; (...)}");

textEdit->setStyleSheet("QTextEdit{margin-left: 30px; (...)}");

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the result looks like this:
1.png
QTextEdit is resized, and scroll bar is moved with it.

I would like to achieve something like this:
2.png
Margins/indents are within QTextEdit and scrollbar is on the right just by window frame.

I tried with:

textEdit->setStyleSheet("QTextEdit{text-indent: 60px}");

textEdit->setStyleSheet("QTextEdit{text-indent: 60px}");

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but that doesn't work.

I also tried with QTextBlockFormat:

textCursor = new QTextCursor(textEdit->textCursor());
textBlockFormat = textCursor->blockFormat();
textBlockFormat.setTopMargin(50);
textBlockFormat.setLeftMargin(50);

textCursor = new QTextCursor(textEdit->textCursor());
textBlockFormat = textCursor->blockFormat();
textBlockFormat.setTopMargin(50);
textBlockFormat.setLeftMargin(50);

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but that also doesn't work.

Anyone can guide me how to achieve this?