Texteditor.GetText -- export portion of the current text (V1.1)
t$ = mui.DoMethod(id, "GetText", x1, y1, x2, y2)
This method exports portions of the current text and returns it.
The method accepts four coordinates which permits you to retrieve a
block of text without it being currently marked. This is useful to
analyze a block without the user seeing a similar behaviour to marking