D5605: Allow multiple categories with the same name

[Marco Martin]

mart created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  the category name was intended as a kind of unique id,
  this isn't true anymore, so multiple categories can have
  the same name (even if having a different display_name)
  this makes content listing of category names with
  multiple ids work

TEST PLAN
  on store.kde.org the category 399 is going to have the
  Plasma 5 Plasmoid name, tested with it and works (name
  got back to the old one now)

REPOSITORY
  R304 KNewStuff

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5605

AFFECTED FILES
  src/attica/atticaprovider.cpp

To: mart, #plasma, leinir
Cc: plasma-devel, #frameworks, spstarr, progwolff, Zren, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, lukas
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