Implement grammar/function editing mechanisms
try to reuse from schema editor
(from redmine: issue id 426, created on 2018-01-22tgradl, closed on 2018-01-22)
- Relations:
- relates #396
try to reuse from schema editor
(from redmine: issue id 426, created on 2018-01-22tgradl, closed on 2018-01-22)