D26753: Disable internal PDFium-based viewer on Qt 5.13+

[Alexander Lukichev]

alukichev created this revision.
alukichev added a reviewer: Falkon.
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REVISION SUMMARY
  Qt 5.13+ has a built-in PDFium-based PDF viewer enabled in
  QWebEngineSettings by default. There is no way to disable it at
  run time by the user, and leaving it "as is" changes the browser's
  behavior, depending on which version of Qt is installed on a
  target system. The built-in plugin currently has quite a limited
  functionality and, e.g., misses ability to download the document
  being viewed.
  
  This disables internal Qt's PDF viewer, keeping behavior on newer
  systems (with Qt 5.13+) the same as on older ones.

REPOSITORY
  R875 Falkon

REVISION DETAIL
  https://phabricator.kde.org/D26753

AFFECTED FILES
  src/lib/app/mainapplication.cpp

To: alukichev, #falkon
Cc: falkon, alukichev, grune, akilgus, siraj_qazi, saishm, anmolgautam, SGOrava, iodelay, spoorun, ptabis, navarromorales, clivej, mparillo, ach
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