Checks if the icon is symbolic or not.
This currently uses only the file name and not the file contents for determining this. This behaviour may change in the future.
Note that to render a symbolic GtkIconPaintable properly (with recoloring), you have to set its icon name on a GtkImage.
%TRUE if the icon is symbolic, %FALSE otherwise
See Implementation
Checks if the icon is symbolic or not.
This currently uses only the file name and not the file contents for determining this. This behaviour may change in the future.
Note that to render a symbolic GtkIconPaintable properly (with recoloring), you have to set its icon name on a GtkImage.