`TextArea` scrollbar position is not updated after paste

[TomJGooding]

To reproduce, first copy some long text to your clipboard (e.g. the Textual demo code). If you then run the TextArea example (docs/examples/widgets/text_area_example.py) and paste this text, the vertical scrollbar position has not been updated correctly where it should be at the bottom.

[github-actions]

We found the following entries in the FAQ which you may find helpful:

• How do I center a widget in a screen?
• Does Textual support images?

Feel free to close this issue if you found an answer in the FAQ. Otherwise, please give us a little time to review.

This is an automated reply, generated by FAQtory

[TomJGooding]

While trying to debug this with textual console on the same screen, I've found the vertical scrollbar does seem to update correctly if the horizontal scrollbar is also triggered.