Asynchronously load, render and scale a symbolic icon previously looked up from the icon theme using gtk.icon_theme.IconTheme.lookupIcon.
For more details, see gtk.icon_info.IconInfo.loadSymbolicForContext which is the synchronous version of this call.
a #GtkStyleContext
optional #GCancellable object, null to ignore
a #GAsyncReadyCallback to call when the request is satisfied
Asynchronously load, render and scale a symbolic icon previously looked up from the icon theme using gtk.icon_theme.IconTheme.lookupIcon.
For more details, see gtk.icon_info.IconInfo.loadSymbolicForContext which is the synchronous version of this call.