We do not have a method to retrieve only icons from the icon set. The only methods do retrieve all icons from an iconTheme, even those that are only there for backward compatibility.
I think it'd still be better to pick this method, displaying all the icons available for the selected iconTheme even if they are not available in the current iconTheme.
One issue that could cause is a very high number of icons when checking out Silk. There's more than used to be on FontAwesome too, but that's kinda manageable.
Eventually it could be useful to add a search field to filter the icon names.
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