Fix exception when rotating skewed item.#63

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jongleur1983 wants to merge 3 commits intoicsharpcode:masterfrom

jongleur1983:Issue36-RotateSkewedItem

Commits on Oct 5, 2019

Implement failing test: Test fails by exception
jongleur1983
committed
insertion after the last element is the same as AppendChild - but AppendChild works.
jongleur1983
committed
refactoring: merge cases with identical content
jongleur1983
committed