In WPF hittest, caret and text selection are on the right when RTL is enabled.

The first screenshot shows the behavior in Noesis. The second screenshot shows the behavior in WPF.

Minimal code to reproduce bug:

<Page
  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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  mc:Ignorable="d"
  d:DesignWidth="1920"
  d:DesignHeight="1080"
  Background="#FF4D5052">
  <Grid Background="Black" >
    <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center">
      <StackPanel Orientation="Horizontal">
        <TextBlock Foreground="White" TextAlignment="Right" VerticalAlignment="Center" Text="Left"/>
        <TextBox TextAlignment="Left" Width="500" Height="50" Margin="5" Text="test text"/>
      </StackPanel>
      <StackPanel Orientation="Horizontal">
        <TextBlock Foreground="White" TextAlignment="Right" VerticalAlignment="Center" Text="Right"/>
        <TextBox TextAlignment="Right" Width="500" Height="50" Margin="5" Text="test text"/>
      </StackPanel>
      <StackPanel Orientation="Horizontal">
        <TextBlock Foreground="White" TextAlignment="Right" VerticalAlignment="Center" Text="RightToLeft"/>
        <TextBox FlowDirection="RightToLeft" Width="500" Height="50" Margin="5" Text="test text"/>
      </StackPanel>
    </StackPanel>
  </Grid>
</Page>