Minor product/technical issues:
- Interaction with T1812. We can use the 'closed' special for now and deal with this later. This implies a minor doc update on D8584.
- Very old IE and multi-button forms don't work, but I'm pretty sure we're far clear of all versions where this matters.
- If you select a status in the dropdown and then click the "close" button, we should probably respect the dropdown version, not the button version.
- If the task is already closed, but not in the closed state the button implies, I guess we hide it? Or do we "Reopen" into the 'default' special?