No easy way to use scaled icons
SVG icons are easy to scale, but saving the icon using Icon Library saves an icon that advertises itself as 16x16, and GtkImage
doesn't give an easy way to losslessly scale the icon to another size when loading it from a GResource
(which means loading the file as a GdkPixbuf).
I had to install the icon as a file in a theme directory, and load it by name to be able to size it as a GTK_ICON_SIZE_DIALOG
.