ShowCursor(false) doesn't work. Window not created on UI thread?

[tom-huntington]

Describe the bug

I cant hide the cursor with ShowCursor

During the conversion to Win32, the cursor show counter became a thread-local state. (Naturally, multiple threads could merge their cursor show counters by attachment.) Consequently, when a thread calls ShowCursor it affects the cursor show state only for windows that belong to that thread.

https://devblogs.microsoft.com/oldnewthing/20091217-00

This suggests the UI thread was not used to create the window.

Steps to reproduce the bug

https://github.com/tom-huntington/ShowCursorMRE

Expected behavior

I expect some way to hide the cursor

NuGet package version

WinUI 3 - Windows App SDK 1.6.1: 1.6.240923002

Windows version

Windows 11 (21H2): Build 22000

[castorix]

ShowCursor is for Win32 cursors
You can change/hide cursor for XAML UIElements with ProtectedCursor
(threads like microsoft/WindowsAppSDK#1816, microsoft/WindowsAppSDK#3601, ...)

[tom-huntington]

I noticed that ShowCursor does in fact hide the cursor... for the window chrome. Some how this is getting overwritten for the client region.