D8863: Workaround to build with older Qt

[Albert Astals Cid]

aacid created this revision.
Restricted Application added a subscriber: Okular.
Restricted Application added a project: Okular.

REVISION SUMMARY
  As explained in the comment we can do with using an older Qt since what this adds is really a small nicety in a corner case
  
  Give warnings when the file is modified externally
  
  Unfortunately, poppler (the only backed that supports saving) is not able
  to save properly if the file is modified by a third party while it is opened
  
  So we give the user a warning saying things went wrong and give him the option
  to not reload/close, that way if there was something very important in the annotations
  she added she can try to save them (even if by copy&paste the contents to a third program)

REPOSITORY
  R223 Okular

BRANCH
  file_modified_externally

REVISION DETAIL
  https://phabricator.kde.org/D8863

AFFECTED FILES
  core/document.cpp
  part.cpp
  part.h

To: aacid
Cc: #okular, ngraham, aacid
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