CustomFont for ThumbnailIcon doesn't reflects to TreeIcon

[jonascarlbaum]

Using CustomFont on ThumbnailIcon and adding <add key="FontThumbnail.EnableTreeIcons" value="true"/> in web.config doesn't generate any tree icon.

I have the FontAwesome PRO-set and are using it like this:
[ThumbnailIcon("fa-light-300.ttf", 0xf022)] for the list-alt icon in FAL.

Configured like this:

    <add key="FontThumbnail.BackgroundColor" value="#0b496e" />
    <add key="FontThumbnail.ForegroundColor" value="#ffffff" />
    <add key="FontThumbnail.FontSize" value="40" />
    <add key="FontThumbnail.CustomFontPath" value="Assets\vendors\" />
    <add key="FontThumbnail.EnableTreeIcons" value="true"/>

Of course I can use two attributes to get it to work with the wrong font.

    [ThumbnailIcon("fa-light-300.ttf", 0xf022)]
    [TreeIcon(FontAwesome5Regular.ListAlt)]

But it would be nice if it was possible to do something like adding a third parameter for Page Tree Icon-fallback:

[ThumbnailIcon("fa-light-300.ttf", 0xf022, "fal fa-list-alt")]

Or supporting adding class as free text in TreeIcon

[TreeIcon("fal fa-list-alt")]

The free text "thingy" would make completely different icon fonts (not only adding support of FontAwesome PRO) usable in page tree too, as you already solved for thumbnail icons in ThumbnailIcon-attribute by having ttf-reference and charcode-support... 👍