Touch/Stylus pen drawing on WPF InkCanvas is not DPI Aware.

• .NET Core Version: Not tested
• Windows version: (winver) 1909 or later
• Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes
• Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc…)? No

Problem description: When Per Monitor DPI Awareness is enabled, Ink Strokes with touch/Stylus pen on WPF InkCanvas are drawn wrong scale/position after monitor DPI changed.

Per Monitor DPI Awareness works well with touch/stylus pen for button click, element dragging on Canvas, and so on. However, InkCanvas may not aware DPI change and follow primay screen scale.

Actual behavior:

Mouse drawing works correctly but, Inks with Touch/stylus pen are drawn to incorrect position/size after MainWindow is moved to extended monitor with different scale.

Expected behavior:

Inks with Touch/stylus pen must be drawn to correct position/size after MainWindow is moved to extended monitor with different scale.

Minimal repro:

The issue can be reproduce as the following step (two monitors are required).

1. Create a WPF application (.NET Framework 4.0~4.8)
2. Add a InkCanvas control in MainWindow.
3. Set Per Monitor DPI Awareness setting as https://github.com/microsoft/WPF-Samples/tree/main/PerMonitorDPI
4. Set the scale of each monitor with different value like 100% for Display1 and 125% for Display2.
5. Run the application and move window to extended monitor.
6. Draw inks with mouse/touch/stylus pen.
7. Mouse strokes are correct but touch/stylue pen strokes are not correct (the stroke points may be scaled according to the difference between monitor scales.

[pchaurasia14]

@lindexi - Fixes on .NET Framework will be limited to security vulnerabilities or bugs that are filed as DTS issues.

[lindexi]

@jheraldP Sorry, I don’t know.

@singhashish-wpf Could I ask you it will be merged on .NET Framework 4.8?