I think I found a bug.
What I do:
Select several glyphs, some of which have kerning groups (the same ones), some which don’t. Instead of getting “multiple values”, as I would when I select glyphs with different groups, I get the values of the ones that have them present, and I cannot change them.
Just to clarify, I select “a” which has the kerning groups o and n, and select a.ss01 as well, which has no kerning groups set. I cannot change the groups for a.ss01, since in the left pane o and n appear as its groups and I cannot change them.
On further inspecion, i can change them to something different than o and n.
I fixed that. Thanks