One way moving task between columns restriction

Questions
1

Is it possible to have restriction like this? To allow user moving task from column A to B, but deny from B to A?

2

I’ve just come across this. I assumed that the restriction was already one-way because it asks for a ‘source’ column and a ‘destination’ column and allows another restriction to be created in the opposite direction.

I’ve had a look at the code history on GitHub and it looks like it was a one-way restriction initially but was subsequently changed to two-way. I’ve re-enabled one-way restrictions on mine by removing 3 lines in the app/helper/ProjectRoleHelper.php file as shown below:

    public function canMoveTask($projectId, $srcColumnId, $dstColumnId)
    {
        $role = $this->getProjectUserRole($projectId);

        if ($this->role->isCustomProjectRole($role)) {
            if ($srcColumnId == $dstColumnId) {
                return true;
            }

            $sortableColumns = $this->columnMoveRestrictionCacheDecorator->getSortableColumns($projectId, $role);

            foreach ($sortableColumns as $column) {
                if ($column['src_column_id'] == $srcColumnId && $column['dst_column_id'] == $dstColumnId) {
                    return true;
                }

// Remove below this line
//                if ($column['dst_column_id'] == $srcColumnId && $column['src_column_id'] == $dstColumnId) {
//                    return true;
//                }
// Remove above this line
            }

            return empty($sortableColumns) && $this->isAllowedToMoveTask($projectId, $role);
        }

        return true;
    }