R1:4fe09a0ac71f

Add passthru to AphrontRequest

Summary:
For transaction interfaces, I want to prompt the user when they take an action that has no effect, e.g.:

Action Has No Effect

You can not close this task, because someone else has already closed it.

Do you want to post your comment anyway?

[Cancel] [Post Comment]

We already do this for Differential, but it's all hard-coded. T912 is an open task for fixing this for Maniphest.

To do this in a general way, I want to embed the entire request in the…