625ad2af77
This code only worked for port groups that themselves (the specific group instance) listed their designations. This worked with LSP, which redundantly duplicates the elements from the group's class for some reason, but not with other plugins like MDA which simply refer to a standard group like <http://lv2plug.in/ns/ext/port-groups#StereoGroup>. This does require the specification data to be loaded from the LV2 path (maybe why LSP does that?), but that's generally expected for anything LV2 to work.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html