See issue #293 where memory and performance can degrade with a high number of lines written to the Text widget.
This is a very simplistic implementation to limit the possible length the text buffer can grow to with the `maxContent` option.
Default value of -1 means there's no limit and therefore behaviour should remain standard.
It has been working in our test app and allows the use of the Text widget to monitor logs (ie tail) and therefore doesn't bloat over time, but happy to adjust as required.
