[Kernel] Add ellipse shape and bezier connections to LWFXEF-based editors.
(from redmine: issue id 3873, created on 2019-11-26, closed on 2020-05-11)
- Relations:
- relates #3902 (closed)
- blocks #3927 (closed)
- parent #3878 (closed)
(from redmine: issue id 3873, created on 2019-11-26, closed on 2020-05-11)