Hello!
According to the comments, the new version of Icon Tasklist applet support windows grouping:
https://dev.solus-project.com/T4269
https://solus-project.com/forums/viewtopic.php?f=8&t=11479
Will this update be availible to 18.04 budgie users and when it can be expected?
If not, is it possible to update it by hand?
Thanks!
Upd: found this on github.
It is merged into main repo.