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By default RecyclerView assumes any item change *might* need animation. It then creates a new copy of the item that has changed, and interpolates between the two to "animate" the change. We don't need that for topsites (the RecyclerView's we use inside each TopSitePanel already animate changes, the overall size doesn't change - moreover ViewPager state gets lost if you create a new panel), so we override this behaviour to retain the existing panel. This stops the previously visible horrible flickering. (Every time history changes, which can happen if sync is working, or even if a page finishes loading in the background, the DB is changed, and a reload is triggered. Prior to this commit, topsites would flicker horribly, and would reset back to the first topsites page. After this commit the page is retained, and the visible topsites are rearranged by the inner RecyclerView's animations. You can test this by pinning a site on the first page, the pinned site will shift to the front, the other sites smoothly move to the right.) MozReview-Commit-ID: CnocNfdQ2FS --HG-- extra : rebase_source : 3a4e1d86c786126aee1e08ab020b855056e4f921
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