Do not wrap_visibleVisualLines over _allVisualLines
Do not wrap_visibleVisualLines over _allVisualLines

Taking a look to the original avalonedit's textview, when creating the readonlycollection for the _visibleVisualLines it doesn't wrap a collection over the _allVisualLines.

It uses .ToArray() to make the _visibleVisualLines to be a new collection.

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