Are Qt's stylesheets really handling _dynamic_ properties?

Question

Is Qt's dynamic properties really so dynamic with stylesheets?

I have the basic example from stylesheets and dynamic properties:

/*stylesheet:*/
*[field_mandatory="true"] { background-color: "yellow";}

And I have this happening at runtime somewhere in the code:

/*code:*/
myWidget->setProperty("field_mandatory", field->isFilled() );

Nothing changes in UI, when this property is changed at runtime.

Does anyone have ideas what must be done to update Qt's stylesheet engine when changing properties, or is it even capable handling these kinds of cases?

Btw. I'm using Qt 4.4

Answer 1

Qt has the following recommendation in their FAQ:

style()->unpolish(theWidget);
style()->polish(theWidget);

They also say you can reset the stylesheet by doing the following but it is more expensive:

setStyleSheet(styleSheet());