Keyboard on iPad moves modal fade background

Created by: chrisseaton

I'm using Bootstrap for an iPad web app. I use the modals to present input controls. The screen looks like this when the modal is opened:

That's what I'd expect - it's off the screen a bit at the bottom due to its size, which is what I think is correct with the new modals.

However, when I click in one of the input controls, Safari I think centres the input control, and the modal's fade background is no longer in the right place:

This is 3.0 RC1.