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This change sets the "lastScroll" property to each urlHistory item ob…
…ject, allowing us to remember previous scroll distances when returning to a page that has since been removed from the DOM. Before this change, this number was stored in data on the page element, so it is lost when the page is removed after pagehide. Also, this change removes a reference in memory that we were keeping to the $activeClickedLink on each page. We stored this in attempt to refocus a link after returning to a page. Unfortunately, it doesn't seem that this data can be retained after pages are removed from the DOM, outside of somehow remembering a unique selector string to reach that element again (which could be achieved by adding some overhead, ala http://stackoverflow.com/questions/2068272/getting-a-jquery-selector-for-an-element )
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