[Bug 744580]

[Chris Coulson]

(In reply to comment #6)
> Probably simpler to use nsIntRect(...).ToAppUnits(...);

Thanks, I didn't realise that existed. In any case, as aPoint is already
in app units, it doesn't seem to make things any easier.

I'm attaching an updated patch now, slightly tidied and with a test case

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https://bugs.launchpad.net/bugs/744580

Title:
  Firefox doesn't auto scroll when selecting content downwards