Wino-Mail/Wino.Mail.WinUI/Dialogs/MessageSourceDialog.xaml

<ContentDialog
    x:Class="Wino.Mail.Dialogs.MessageSourceDialog"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:domain="using:Wino.Core.Domain"
    xmlns:local="using:Wino.Mail.Dialogs"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="{x:Bind domain:Translator.MessageSourceDialog_Title}"
    DefaultButton="Primary"
    PrimaryButtonClick="ContentDialog_PrimaryButtonClick"
    PrimaryButtonText="{x:Bind domain:Translator.Buttons_Copy}"
    SecondaryButtonText="{x:Bind domain:Translator.Buttons_Close}"
    Style="{StaticResource WinoDialogStyle}"
    mc:Ignorable="d">

    <ContentDialog.Resources>
        <x:Double x:Key="ContentDialogMaxWidth">1200</x:Double>
    </ContentDialog.Resources>

    <ScrollViewer HorizontalScrollBarVisibility="Disabled" HorizontalScrollMode="Disabled">
        <Border
            Padding="16"
            Background="{ThemeResource CardBackgroundFillColorDefaultBrush}"
            BorderBrush="{ThemeResource CardStrokeColorDefaultBrush}"
            BorderThickness="1"
            CornerRadius="6">
            <TextBlock
                MaxWidth="1000"
                FontFamily="Consolas"
                FontSize="12"
                IsTextSelectionEnabled="True"
                Text="{x:Bind MessageSource}"
                TextWrapping="Wrap" />
        </Border>
    </ScrollViewer>
</ContentDialog>