Git Diff with Beyond Compare

I have succeeded in getting git to start Beyond Compare 3 as a diff tool however, when I do a diff, the file I am comparing against is not being loaded. Only the latest version of the file is loaded and nothing else, so there is nothing in the right pane of Beyond Compare.

I am running git with Cygwin with Beyond Compare 3. I have set up beyond compare as they suggest in the support part of their website with a script like such:

# diff is called by git with 7 parameters:
# path old-file old-hex old-mode new-file new-hex new-mode
"path_to_bc3_executable" "$2" "$5" | cat

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WPF Binding IsSelected to ViewModel doesn’t set items that haven’t been shown in the List

I have a ViewModel that has an IsSelected property which I bind in my ListView.ItemContainerStyle XAML to an IsSelected property in my view model.

I bring up the application and populate the view model collection (which is shown in my ListView) with a lot of items, say about 2000. Then I select everything in the list via Ctrl-A. The items in my view model collection only get the IsSelected set for the items that are visible in the ListView. If I page down through the list the IsSelected gets set for whatever items get shown. If I page through all the items then all the items in my view model have the IsSelected property set to true.

Here is my XAML for binding the IsSelected in the list view to my view model:

<ListView Margin="5" ItemsSource="{Binding FilteredComparisonList}" x:Name="comparisonListView">
        <Style TargetType="{x:Type ListBoxItem}">
            <Setter Property="IsSelected" Value="{Binding Mode=TwoWay, Path=IsSelected}" />
            <GridViewColumn Header="Source filename" DisplayMemberBinding="{Binding ImageFile.BaseFilename}" Width="Auto" />

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