Commits on Apr 10, 2021

1. Check that the correct pdfDocument is still active, before renderin… …

   …g the outline/attachments/layers
   
   *This patch fixes some technical debt in the viewer.*
   
   Given that most API methods are (purposely) asynchronous, there's always a risk that the viewer could have been `close`d before the requested data arrives.
   Lately we've started to check this case before using the data, to prevent errors and/or inconsistent state, however the outline/attachments/layers fetching and rendering is old enough that it pre-dates those checks.

   

   Snuffleupagus committed Apr 10, 2021
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2. 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!

   

   Snuffleupagus committed Apr 10, 2021
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