Offer a "Cancel and Exit" button if exiting when background process running?

[Scott Kostyshak]

Currently in 2.4.0dev if we try to exit while a background process is
running, we get the following dialog:

  Document could not be closed because it is being processed by LyX.

Riki, thanks to your work on canceling background processes, would it be
easy to add a button like "Cancel and Exit" ?

Scott
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