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When disabling SafeArea, SfShimmer content still use the safe margins.
This is happening with base type as well as CustomViews (setting IgnoreSafeArea=false in a grid within a custom view does not work as well)
In the following exemple, you can see that while the SfShimmer itself respect it, content does not :
<Grid BackgroundColor="Red" IgnoreSafeArea="True">
<shimmer:SfShimmer
BackgroundColor="Blue"
HeightRequest="100"
IsActive="True"
Type="CirclePersona"
VerticalOptions="Start" />
</Grid>

public class CustomSfShimmer : SfShimmer, ISafeAreaView
{
bool ISafeAreaView.IgnoreSafeArea => true;
}