Fixing AppBarButton visual state overlap #6933
Merged
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Following this change, we ran into the issue that we now have two different visual state groups targeting the same property (SubItemChevron.Margin), which can cause problems in that one can pave over the other. I've fixed things by duplicating the SubItemChevron so the states for buttons in the primary and secondary items can be managed separately from each other, and toggled visibility of the two based on where the button is located.
Also added an automated API test that reproduces the issue without the fix.