Fix eclipse-platform/eclipse.platform#1173 - bad UI on MacOS merge viewer · eclipse-platform/eclipse.platform@8b6aefa

CompareViewerPane illegally extends ViewForm

SharedDocumentAdapter implements non-API interface ISharedDocumentAdapter

ContentMergeViewer implements non-API interface IFlushable2

TextMergeViewer illegally references method TypedListener.getEventListener()

IFilePatch extends non-API type IFilePatch2

DiffTreeViewer illegally extends TreeViewer

SharedDocumentAdapterWrapper implements non-API interface ISharedDocumentAdapter

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