sourcegit/src/Resources/Styles/Window.xaml

<ResourceDictionary 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Style x:Key="Style.Window" TargetType="{x:Type Window}">
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="UseLayoutRounding" Value="True"/>
        <Setter Property="Background" Value="{DynamicResource Brush.Window}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="BorderBrush" Value="{DynamicResource Brush.WindowBorder}"/>
        <Setter Property="TextOptions.TextFormattingMode" Value="Display"/>
        <Setter Property="TextOptions.TextHintingMode" Value="Animated"/>
        <Setter Property="TextOptions.TextRenderingMode" Value="ClearType"/>
        <Setter Property="RenderOptions.ClearTypeHint" Value="Enabled"/>

        <Setter Property="WindowChrome.WindowChrome">
            <Setter.Value>
                <WindowChrome CaptionHeight="28" UseAeroCaptionButtons="False" ResizeBorderThickness="4" CornerRadius="0"/>
            </Setter.Value>
        </Setter>

        <Style.Triggers>
            <Trigger Property="WindowState" Value="Maximized">
                <Setter Property="BorderThickness" Value="0"/>
            </Trigger>
        </Style.Triggers>
    </Style>
</ResourceDictionary>