D8522: keyboard navigation in and out QML kcms

[Marco Martin]

mart created this revision.
mart added a reviewer: Plasma.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  QQuickWidget doesn't support keyboard navigation per se,
  the widget will gain keyboard focus on tab, but lose it again at
  the next tab press. this manages manually tab and backtab in the widget
  with an event filter, using an heuristic to know when the tab focus reached
  the last qtquick component and should go out focusing the next widgets

TEST PLAN
  keyboard navigation with tab/shift+tab works as expected
  both in systemsettings and kcmshell5

REPOSITORY
  R295 KCMUtils

BRANCH
  phab/keynav

REVISION DETAIL
  https://phabricator.kde.org/D8522

AFFECTED FILES
  src/kcmoduleqml.cpp
  src/kcmoduleqml_p.h

To: mart, #plasma
Cc: plasma-devel, #frameworks, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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