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List items overlapping in 2.2, 2.1 is OK
List items overlapping in 2.2 apple.css, sencha-touch.css is OK, and 2.1 all OK.
My lists work fine in 2.2. So must be a problem specific to your app. Maybe your other css is compatible with 2.1 but needs changes for 2.2. Either way, you're going to need to post more information before this is can be considered to be a framework bug - because it's probably an issue with your css.