Window out of the screen when maximized using WPF shell integration library

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Windows crops the edges of the window when it’s maximized to obscure what would normally be the resize edges. You can get around this by putting a proxy border between the window and your content and then inflate the thickness when it’s maximized.

I modified the example that came with the lib to do this, the same basic change could be made to your sample:

<ControlTemplate TargetType="{x:Type local:SelectableChromeWindow}">
  <Border BorderBrush="Green">
    <Border.Style>
      <Style TargetType="{x:Type Border}">
        <Setter Property="BorderThickness" Value="0"/>
        <Style.Triggers>
          <DataTrigger Binding="{Binding ElementName=ThisWindow, Path=WindowState}" Value="Maximized">
            <Setter Property="BorderThickness" Value="{Binding Source={x:Static shell:SystemParameters2.Current}, Path=WindowResizeBorderThickness}"/>
          </DataTrigger>
        </Style.Triggers>
      </Style>
    </Border.Style>
    <Grid [...]/>
  </Border>
</ControlTemplate>

I hope that helps.

For .net 4.5 and above, the SystemParameters are a little different, e.g.:

<DataTrigger Binding="{Binding RelativeSource={RelativeSource AncestorType={x:Type local:MainWindow}}, Path=WindowState}" Value="Maximized">
    <Setter Property="BorderThickness" Value="{Binding Source={x:Static SystemParameters.WindowResizeBorderThickness}}"/>
</DataTrigger>

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