[KPageView] For single-depth lists allow changing pages with Ctrl+Tab

Kai Uwe Broulik requested to merge work/kbroulik/kpageview-tab into master

Because we have this weird Ctrl+PgDown shortcut for that, add an explicit Ctrl+Tab to it like is done in Dolphin

  • I can now Ctrl+Tab through multi-page config modules (List mode)
  • I can now Ctrl+Tab through kpropertiesdialog (Tabbed mode)

In Dolphin's config there's a tab inside of one of the pages, it does not react to this shortcut (it's a QTabView)

@ahmadsamir @dfaure @ngraham

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