30c70a6ecd
Improves EPUB close performance.
By wrapping with requestIdleCallback(), we ensure:
1. remove() won't be called right away, so the DOM elements being removed
won't be visible and won't trigger a relayout.
2. remove() won't be called while there are pending UI events, so it
shouldn't cause the UI to hang/lag/stutter.
Combined, these two improvements make the UI hang when closing a large EPUB
mostly imperceptible on my machine.
Addresses #3321; doesn't completely fix it because there's likely more to be
done on the reader side to optimize the DOM.
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