When calling setTextWidth on a QGraphicsTextItem that contains a multi-level HTML list that is wrapped in tables, the width of an indented list item will become constrained by another indented list item further down (see with_setTextWidth.png).

This does not occur if setTextWidth is not set (see no_setTextWidth.png), nor when the HTML string being used is input into an HTML editor (see html_editor_example.png). Putting a high enough value in setTextWidth to fit all the text does not appear to have any effect.

PySide6 example script included in qgraphicstextitem_html_setTextWidth.zip. Commenting out the call to setTextWidth shows the difference in behaviour.

Note: Could QTBUG-37185 be in some way related? It also involves text display issues when setTextWidth is called and rich text is set.