This is a parent task for Outliner-related designs and todos.
== Google Summer of Code 2019 ==
- [x] {T63988}
- [x] {T63989}
- [x] {T63992}
- [x] {T63990}
- [x] {T57746}
- [x] {T57855}
== Other ==
- [ ] {T63991}
- [ ] {T68502}
- [ ] {T68550}
- [ ] {T68498}
- [ ] {T68853}
- [x] {T68429}
- [ ] {T67462}