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[UWP] Window resizing crash

See original GitHub issue

Steps to reproduce:

Version 1.6.1

Resize the window (a few times)

<cvcontrols:ParentScrollView>
                <StackLayout CompressedLayout.IsHeadless="true" Spacing="0">
                    <cvcards:CarouselView ItemsSource="{Binding ImageUrls}"
                                          HorizontalOptions="FillAndExpand"
                                          HeightRequest="313">
                        <cvcards:CarouselView.ItemTemplate>
                            <DataTemplate>
                                <ContentView>
                                    <ffimageloading:CachedImage Source="{Binding ., Converter={c:FromImageUrlConverter}}"
                                                                LoadingPlaceholder="resource://loading.png"
                                                                ErrorPlaceholder="resource://error.png"
                                                                Aspect="AspectFill"
                                                                VerticalOptions="FillAndExpand"
                                                                HorizontalOptions="FillAndExpand"
                                                                WidthRequest="500"
                                                                HeightRequest="313"
                                                                DownsampleToViewSize="true">
                                    </ffimageloading:CachedImage>
                                </ContentView>
                            </DataTemplate>
                        </cvcards:CarouselView.ItemTemplate>
                        <cvcontrols:IndicatorsControl/>
                    </cvcards:CarouselView>
</cvcontrols:ParentScrollView>
</StackLayout>

Get the crash

Cannot change ObservableCollection during a CollectionChanged event.

   at Xamarin.Forms.Platform.UWP.TaskExtensions.<>c.<WatchForError>b__2_1(Object e)
   at System.Threading.WinRTSynchronizationContextBase.Invoker.InvokeCore()