Bullets aren't automatically selected for each Flash message so the slider isn't working properly

[ane-gabriela]

Steps to reproduce:

1. Click on Create
2. Add a title > Create
3. Choose Start Date > Now and Groups > XWikiAllGroup
4. Add in the Message description some text
5. Click on Save & View
6. Check the display in the pop-up and in the top bar
7. Repeat the steps above to add 2 more Flash messages
8. Check the display in the pop-up and in the top bar

Expected results: All the flash messages appear as required.
Each of the three last messages is marked by a bullet in the right side of the flash bar located just under the header.
Each message is shown for 10s after the slider goes to the next one.

Actual results: The bullet points aren't automatically selected for each flash message which makes only the last flash message show in the Flash Bar. If the user manually clicks one of the bullets then the slider works properly and all the flash messages are shown (till the next page refresh)

Environment: Windows 10, XWiki 11.5 with MySQL 5.7 and Edge 18

[mflorea]

It's strange that the merge commit was not listed above. See 403c64a .