This comes from
MDL-65071 where 2 new up/down (sorting) arrows are being added to sort discussions.
Right now we are using different arrow symbols (triangles, arrows...) in different places in the UI. This is issue is about:
1) consider if we should normalize all them (same look).
2) review if their usability is the same (same default, same saved status...)
3) review if all them are accesible.