Ignore SystemParameters.MenuDropAlignment settings in Win11

[lindexi]

In Windows 11, all interface options related to handedness have been completely removed. Now, aside from modifying the registry, there is no way to configure the "Menu appear to the left or right of your hand" feature. I’ve observed that even when the registry option is modified, it no longer affects any applications across the system, including the Notepad app, even VisualStudio. It seems that only WPF still adheres to this setting. However, this adherence makes WPF applications feel inconsistent with system applications.

I believe it’s time to deprecate this option or provide developers with the ability to ignore it via an AppContext configuration.

Reference: #5944 and #4641

The registry key is HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows\MenuDropAlignment

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As @miloush says in #4641 (comment) , we can support the Popup.GetPointCombination to use dynamic resource with MenuDropAlignmentKey rather than directly SystemParameters.MenuDropAlignment.

[miloush]

I still like my suggestion, regardless of whether there is UI or not.

[h3xds1nz]

Makes sense tbh.