ResizableContentControl can not resize correctly in high DPI environment.

Hi,

I made the following XAML, but when resizing ResizableContentControl, there is a phenomenon that the movement amount of mouse cursor does not match the change amount of resizing.
It seems that it operates normally in an environment where DPI is 100%.

How can I fix it so that resizing works properly?

<Window x:Class="WpfApp1.MainWindow"
        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"
        xmlns:shared="http://schemas.actiprosoftware.com/winfx/xaml/shared"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <StackPanel>
        <shared:ResizableContentControl　Padding="0,0,0,6"　ResizeMode="Vertical">
            <DockPanel>
                <Border　Background="Red"　MinHeight="100"/>
            </DockPanel>
        </shared:ResizableContentControl>
    </StackPanel>    
</Window>

I wrote app.manifest as follows.

<application xmlns="urn:schemas-microsoft-com:asm.v3">
    <windowsSettings>
        <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">True/PM</dpiAware>
        <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitor</dpiAwareness>
    </windowsSettings>
</application>

Environment

• Windows10 Pro x64 1809
• .NET 4.7.1
• DPI=150%