public RestoreCaretAndSelectionUndoAction(TextArea textArea)
{
textAreaRef = new WeakReference(textArea);
caretPos = textArea.Caret.Position;
selection = textArea.Selection;
}
public TextEditor(TextArea textArea)
{
this.TextArea = textArea;
textArea.SetBinding(TextArea.DocumentProperty, new Binding("Document") { Source = this });
}