D18849: [KPropertiesDialog] Fix group combobox

[Christoph Feck]

cfeck created this revision.
cfeck added reviewers: Frameworks, Dolphin.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
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REVISION SUMMARY
  `groupList` was never initialized with `KUser::groupNames()`, causing the subsequent combobox setup to be skipped.
  
  BUG: 403074

TEST PLAN
  `kpropertiesdialogtest` shows a combobox with `users` and `audio` groups on my system. Without this patch, no combobox appears.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D18849

AFFECTED FILES
  src/widgets/kpropertiesdialog.cpp

To: cfeck, #frameworks, #dolphin
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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