Add indicators for the TabbedContent widget

[cntvc]

Feature request: add indicators for the TabbedContent widget, so that users can know there are more tabs available when the screen cannot display all TabPanel.

for example:

[github-actions[bot]]

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

• How do I center a widget in a screen?

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

[davep]

If you're asking if TabbedContent currently supports that: no, that isn't something there at the moment.

[willmcgugan]

Feels like a good idea though.

[davep]

Seconded.

[cntvc]

If you're asking if TabbedContent currently supports that: no, that isn't something there at the moment.

Yes, it's just a suggestion.

[TomJGooding]

Perhaps something to consider is that users might expect these indicators to be clickable to scroll the tabs?