This particular test seems rather flakey in GitHub's actions. In most cases
passing, with the odd fail here and there (normally when unrelated changed
are made -- I've had this fail when docs have been changed; zero code
changes!)
So, on the off chance that a little extra pause will help...
Ensures that the actual content gets changed when TabbedContent.active is
updated via code. Also adds more testing for TabbedContent.
See #2352 for details.
* Add a message for the tabbed content activated
* Add a docstring
* Testing tabbed content activated message
* Update changelog
* Add reference to the docs about TabbedContent.TabActivated
