Make deletion of unused tab bars conditional to dockwidget and tabwidget features. Task-number: QTBUG-135468 Pick-to: 6.8 6.5 Change-Id: I0ecb55ab20737f401796cdd4ebbc6040e54b5afe Reviewed-by: Axel Spoerl <axel.spoerl@qt.io> (cherry picked from commit b37f84ba414f36d941d42f7addb2f8ca1516d3d6) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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