Looks up a icon for a desired size and window scale.
The icon can then be rendered by using it as a `GdkPaintable`, or you can get information such as the filename and size.
| this |
a `GtkIconTheme` |
| icon |
the `GIcon` to look up |
| size |
desired icon size |
| scale |
the desired scale |
| direction |
text direction the icon will be displayed in |
| flags |
flags modifying the behavior of the icon lookup |
|
a `GtkIconPaintable` containing information about the icon. Unref with unref |