QTextDocument: Very big font size with multiline markdown makes app stuck in infinite loop when calling size()

Setting very big font size, adding multiline markdown text and calling QTextDocument's size() method makes app stuck in infinite while loop inside QTextDocumentLayoutPrivate::layoutBlock().

Way to reproduce:

• Create QFont with very big pointSize (i.e. 20'000'000).
• Create QTextDocument and set this font as default font.
• Set document content with setMarkdown with multiline text (i.e. "TEST \n\n\n STRING").
• Call document's size() method.
• App freezes.

Please let me know if you need more information