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I'm following the one hour tutorial on the website to get back on track after 1,5 years non-Vaadin work.
I noticed in https://vaadin.com/tutorial/-/chapter/skeleton.html the SplitPanel is deprecated API in 6.7.5. Maybe it's best to directly use the correct alternative in the tutorial.
Just my 2 cents :-)
It looks like there's already a ticket about this. Changing the text would be five minutes, but it's best to fix the code first so that goes right. Updating the tutorial code is not so trivial.