D9940: Fix memory management for internal Completer of the combo box editor (when extraValueAllowed=true)

[Jarosław Staniek]

staniek created this revision.
staniek added a reviewer: piggz.
Restricted Application added a project: KProperty.
staniek requested review of this revision.

REVISION SUMMARY
  - Fix memory management
  - Add a property with extraValueAllowed=true for the example app
  
  FIXED-IN:3.1.0
  
  TRIVIAL Optimize keys retrieval for the value of combo box editor, remove unnecessary code

TEST PLAN
  Try List, List 2 and Editable List properties of the kpropertyexample app.
  Try e.g. data source property for elements in KEXI reports or KReportExample

REPOSITORY
  R13 KProperty

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9940

AFFECTED FILES
  examples/window.cpp
  src/editors/combobox.cpp

To: staniek, piggz
Cc: Kexi-Devel-list, staniek
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