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* Splits a KateViewSpace into two in the following steps:
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* 1. create a QSplitter in the parent of the KateViewSpace to be split
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* 3. create new KateViewSpace and added to the new splitter
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* 4. create KateView to populate the new viewspace.
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* 5. The new KateView is made the active one, because createView() does that.