D29613: Support multiple entries in XDG_DATA_DIRS

[David Faure]

dfaure created this revision.
dfaure added reviewers: dvratil, mlaurent, vkrause, skelly.
Herald added a project: KDE PIM.
Herald added a subscriber: kde-pim.
dfaure requested review of this revision.

REVISION SUMMARY
  Multiple themes named "Default" were inserted into the QMap,
  one for my prefix and then one for /usr/share, which replaced it.
  What we want is this to be a single theme with multiple search paths.

TEST PLAN
  This fixes the "Kontact introduction" in my developer
  setup where everything is installed into a custom prefix.
  Before this fix, only /usr/share/messageviewer/about was looked at,
  and I don't have kontact installed there.

REPOSITORY
  R77 PIM: Grantlee Theme

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D29613

AFFECTED FILES
  src/grantleetheme.cpp
  src/grantleetheme.h
  src/grantleetheme_p.h
  src/grantleethememanager.cpp

To: dfaure, dvratil, mlaurent, vkrause, skelly
Cc: kde-pim, fbampaloukas, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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