The messaging system is being redesigned. One part of the messaging system is the "InfoBar", which in the Figma design is called "Banner".

The current InfoBar offers space for a couple of widgets and sets a predefined "Yellow" background color:

The new concepts defines clearly distigishable kinds of InfoBar: e.g. Info/Warning/Error. The InfoBar automatically has the right icon, background color and perhaps text color:

This is anologous to the concept that Qt Creator's InfoLabel already has:

It would make sense to align the implementation of the redesigned messaging system (InfoBar and others) with what InfoLabel does.