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Created attachment 17195 [details]
Sample project with StackTrace in a txt file
ListView's GroupHeaderTemplate do not work with DataTemplateSelector on Android (Xamarin.Forms 220.127.116.11). The application crashes.
Works fine on iOS.
Not tested on Windows Phone.
Sample project attached.
StackTrace.txt is inside the Sample Project's zip file.
The error seems to be in ListViewAdapter.GetItemViewType():
item = TemplatedItemsView.TemplatedItems.GetGroup(group).ListProxy[row];
item = TemplatedItemsView.TemplatedItems.ListProxy[position];
This second line is getting the first item within the group, rather than the group object itself.
Bug still exists in Xamarin Forms stable 18.104.22.1680. Bump: fix