Mac OSX please don't scale width for application status icons

On the mac Qt forces status icons to be a fixed, square size.

While it makes sense to scale the image to fit in the available height
of the menu bar, no such constraints seem to exist for the width.
It is fairly common on the Mac to use glyphs wider than 18
pixels in status items (such as Apple does with the Battery and WiFi
status items).

This behavior is set in the method
QSystemTrayIconPrivate::updateIcon_sys(), where both height and width are set to a single value.

It would be nice if status icons could keep their height and width aspect ratio when used on the mac..