How to "reset" indent if I remove a QTextList

[Revi]

Hello,
I write at the moment a HTML Editor based on QTextEdit and at the moment I have some problems with a list.
I create a QTextlist with:

ui.textEdit->textCursor().createList(QTextListFormat::Style::ListCircle);

I want that only the list format is removed. So that the text looks exactly before I inserted the list.
I remove the list with:

ui.textEdit->textCursor().currentList()->remove(ui.textEdit->textCursor().block());

After I did that the list format is correctly removed but the indent is still 1 instead of zero.
I tried then to manually set the indent to 0 with these functions but it didn't work:

ui.textEdit->textCursor().blockFormat().setIndent(indent);
ui.textEdit->textCursor().block().blockFormat().setIndent(indent);

Does anybody has an idea how to correctly change the indent after removing the QTextList.