D6540: Use QActionGroup in icon border default marker menu

[Christoph Roick]

croick created this revision.
Restricted Application added subscribers: Frameworks, kwrite-devel.
Restricted Application added a project: Frameworks.

REVISION SUMMARY
  - the current checkboxes imply that it is possible to select more than one default marker, QActionGroup groups them to one possible selection

TEST PLAN
  - right-click the icon border, use radio-buttons in default marker selection

REPOSITORY
  R39 KTextEditor

BRANCH
  defaultmarker

REVISION DETAIL
  https://phabricator.kde.org/D6540

AFFECTED FILES
  src/view/kateviewhelpers.cpp

To: croick, #ktexteditor
Cc: kwrite-devel, #frameworks
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