Prevent "offsetParent is not set -- cannot scroll" errors when the viewer loads in e.g. a hidden <iframe> #11129
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Besides avoiding errors during loading, this also ensures that the document will be correctly scrolled/zoomed into view once the viewer becomes visible.
This "new" behaviour was always intended, see PR #2613, however various re-factoring over the years seem to have broken this (and I'm probably at least somewhat responsible for that).