D6767: do not keep constructing new selectionmodels

[Harald Sitter]

sitter created this revision.
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REVISION SUMMARY
  simply change its underlying model after it has been initialized once.
  
  ideally I suppose instead of changing the model at all we should have a
  full model and put a qsortfilterproxymodel in front of it thus making
  setContents in its current form obsolete as we'd then only need to filter
  as necessary. I am not quite confident enough in my understanding of
  how the code presently works to make such an invasive change.

TEST PLAN
  tests still passing

REPOSITORY
  R236 KWidgetsAddons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6767

AFFECTED FILES
  src/kcharselect.cpp

To: sitter, cfeck
Cc: #frameworks
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