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As a consequence of https://github.com/atom/atom/pull/15378, we are now able to render highlight decorations in a separate div, as opposed to having an highlight container for each tile. Code-wise this is much simpler, because highlights spanning multiple tiles can be represented via a single region and don't need to be split across the tiles they span anymore. As a byproduct, performance should improve as well, because the number of nodes that need to be managed should decrease significantly. This also fixes https://github.com/atom/atom/issues/15449, and other similar rendering artifacts, because highlight decoration DOM nodes won't need to move between tiles anymore when their position changes.