ICE-2860 makes the inputFile POST its surrounding form, before and after the file upload, so that the user interface may show an indeterminate progress bar during the upload. That's for when the application is running in synchronous mode, and can't push progress notifications. But, it also happens when in asynchronous mode, which may be undesirable. And it's a bit of an incompatible behavioural change, since before the inputFile did not submit its parent form, whereas now it will.

I recommend adding an attribute, to control when the form submissions may occur. It should be able to enumerate the following modes:

Never
  - Form submissions would never occur
NotAsync
  - Form submissions would not occur if the app was in asynchronous mode
Before
  - Form submission would occur before the file upload
After
  - Form submission would occur after the file upload, perhaps to process form fields along with the file
BeforeAndAfter
  - Form submission would occur before and after the file upload, which is the current behaviour, to support synchronous mode