| ⇢ | A | AddMemberActionColumn added |
| ⇢ | A | AddMemberActionColumn::init() added | |
| ⇢ | A | AddMemberActionColumn::initUrlCreator() added | |
| ⇢ | A | AddMemberActionColumn::initVisibleButtons() added | |
| ⇢ | A | AddMemberActionColumn::initDefaultButtons() added | |
| ⇢ | A | AddMemberAction::addMember() added | |
| A | ↘ | B | AddMemberAction::run() got worse |