When converting a QIcon to a vector of images to D-Bus, the list of
available sizes is used to extract the pixmaps of the icon. In case
the engine of the icon advertizes no sizes, then no pixmaps are sent:
this is the case of the SVG icon engine shipped with QtSvg, so creating
a QIcon from an SVG file means nothing is sent for it.
As solution, use a list of few well-known sizes in case no size is
available: this way there is the possibility to have some pixmaps for