Jonas Jenwald 27062f72c2 Improve the handling of the currentOutlineButton enabling/disabling (PR 12777 follow-up)
It's obviously better and more correct to handle the "pagesloaded" case within `PDFOutlineViewer` *itself*, rather than essentially splitting the logic in two parts and forcing `PDFSidebar` to deal with what should've been handled internally in `PDFOutlineViewer`.

This is what I *should* have done in PR	12777, but for some reason didn't figure out how to implement it well enough back then; sorry about the churn here!
2021-04-10 13:12:47 +02:00
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