What I want are two features:
1. Now use `displays on same row as` to align. As for Task2, can I use something like `[Task2] displays on row 1` to make it on the same row as Task1? As we may have several tasks, if Task2 depends on Task1 and someday Task1 is removed, we had to change the code.
2. The second requirement is I expect Task2.1 sits the same row as Task1.1. But it's not. I have to specify it. Is it possible Task2.1 will automatically align to Task1.1?
gantt plantuml code:
[Task1] lasts 4 days
then [Task1.1] lasts 4 days
[Task1.2] starts at [Task1]'s end and lasts 7 days
[Task2] starts 3 days after [Task1]'s end
[Task2] displays on same row as [Task1]
[Task2] lasts 15 days
then [Task2.1] lasts 4 days
'[Task2.1] displays on same row as [Task1.1]