Offset changes when Navigation Bar appears/disappears while refreshing

[AgentCosmic]

Here's how to reproduce:

1. Enable hidesBarsOnSwipe on navigation controller
2. Pull to refresh
3. While refreshing, swipe scroll view to make navbar appear/disappear
4. After refresh is done, the refresh view will not return to it's original position

Repeating these steps will make it go lower and lower.

A quick solution for me was to disable hidesBarsOnSwipe while it's refreshing.

[Sneakr]

Same goes for the contentInset.bottom in INSInfiniteScrollBackgroundView.m row: 231, it gets higher and higher. doesnt matter what I set it to, it fails either way.