Delete completed tasks

[udenr]

Add an option to delete all completed tasks

[0xC0FFEEC0DE]

One option to realize that: A boolean setting that means "Automatically move done tasks to recycle bin"
Another option: A button "move done tasks to recycle bin"
What is the preferred option?

[udenr]

I think both options are fine but as a first step I would prefer a button as it might be confusing for some users if their tasks disappear automatically when they mark them as done. But having this option might also be interesting for some users.