D25700: [KHistoryComboBox] Add method to set an icon provider

[Nicolas Fella]

nicolasfella created this revision.
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REVISION SUMMARY
  An icon provider can be any function that takes a QString and returns a QIcon. This shall replace the setPixmapProvider to allow defining icons by name.
  
  Deprecation of setPixmapProvider will be done once the users are ported

TEST PLAN
  Tested with KDirSelectDialog and a patched plasma-integration

REPOSITORY
  R284 KCompletion

BRANCH
  icopro

REVISION DETAIL
  https://phabricator.kde.org/D25700

AFFECTED FILES
  src/khistorycombobox.cpp
  src/khistorycombobox.h

To: nicolasfella, #frameworks
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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