ContextMenu/MenuItem, Dpi in PerMonitorV2 mode, scaling error in WPF with programmatic opening
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Description
Hello,
Using dpi sensitivity in PerMonitorV2 mode, I noticed an issue scaling the 1st MenuItem list of a ContextMenu when switching from a 100% scale monitor to a 2nd 150% scale monitor.
This error occurs in my test program when I open the contextMenu using the left button in the test button click event.
With the right mouse button, the scaling is correct.
The contextMenu is a child of the button in the XML code.
I have found:
1. There is no scaling of the 1st MenuItem list.
2. The MenuItems contained in a MenuItem from the 1st list are correctly scaled.
Framework 4.8 and net .5 give the same error.
If I don't use dpi sensitivity in PerMonitorV2 mode, scaling works fine.
I am attaching a zip file with a test program with which you can test and verify the problem.
[WpfPopupNet5.zip](https://github.com/dotnet/wpf/files/5624695/WpfPopupNet5.zip)
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