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This mouthful of a class is essentially just a QWidget with a
QVBoxLayout which you can add widgets to. The fun comes from
implementing the QuickOpenEmbeddedWidgetInterface too, by
delegating to the child widgets that got added.

Overall, this allows us to navigate via Alt+Arrow keyboard actions
between combined widgets, as you'd get when you have both, an error
and a declaration at a given cursor declaration.

The AbstractNavigationWidget already supported this, and it was
picked up by KTextEditor. But our own quickopen embedded widget
interface didn't allow going 'back' via Alt + Backspace yet. This
patch fixes this.

Use our format.config.uncrustify.4_spaces config