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The split-view actions define a shortcut using `Konsole::ACCEL`, which since !609 expands to `Qt::CTRL | Qt::SHIFT` on systems that aren't macOS. This breaks the shortcut for the split-view actions however as `Qt::Key_ParenLeft` and `Qt::Key_ParenRight` do not work with the `Qt::SHIFT` modifier. Using `Qt::CTRL` (Cmd on macOS, Ctrl everywhere else) as the base accelerator for these two actions makes splitting views work again as expected.
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