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Easy replacement of deprecated QLinkedList to eliminate compiler warnings

QLinkedList is deprecated. This triggers many compiler warnings with gcc 8.4.0. The fix is easy - replace QLinkedList by std::list. Details are:

  • include <QtCore/QLinkedList> -> include
  • .first() -> .front()
  • .last() -> .back()
  • .append() -> .push_back()
  • QLinkedList -> std::list

Attached files have these suggested changes

poppler-annotation.hpoppler-annotation-private.hpoppler-annotation.cc

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