D8147: Use QActionGroup for input mode selection

[Christoph Roick]

croick created this revision.
croick added a reviewer: KTextEditor.
Restricted Application added projects: Kate, Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  - now shows the current mode at start
  - automatically is mutually exclusive

TEST PLAN
  - select either normal or VI mode

REPOSITORY
  R39 KTextEditor

BRANCH
  defaultinputmode

REVISION DETAIL
  https://phabricator.kde.org/D8147

AFFECTED FILES
  src/view/kateview.cpp
  src/view/kateview.h

To: croick, #ktexteditor
Cc: #frameworks, cullmann, sars, dhaumann
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