Clears the document.
procedure Clear;override;
This method:
▪deletes all content of the document (see RichView.Clear);
▪sets the current text style index (CurTextStyleNo) and the current paragraph style index (CurParaStyleNo) to zeros;
▪clears undo and redo buffers (see ClearUndo);
▪sets Modified to False.
This method does not check ReadOnly, does not reformat and repaint component, does not generate OnChange.
This methods makes the document unformatted.