Overview of changes in 3.20.3
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* Bugs fixed:
 766162 Can't export photos from online accounts
 767892 item-manager: Fix the lifetime of the changes-pending handler
 768130 Keyboard activation leads to a CRITICAL and opens the wrong item
 768500 The sources of remote collections are not shown in
        OrganizeCollectionView
 768548 utils: Don't leak the query string