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CORE-19946 Adapted from PR #7577 Implement the undocumented `IsServerSideWindow()` function in user32. It checks whether a window has a window procedure that resides in kernel mode, and returns a boolean condition based on the appropriate internal window state flag (`WNDS_SERVERSIDEWINDOWPROC`). This function is not officially documented by Microsoft, but there exists unofficial documentation[^1] for it. It is required and used internally by uxtheme.dll from Windows XP/2003/Vista/7/etc. The log spams with it a lot, when using uxtheme.dll from Windows in ReactOS. [^1]: https://undoc.airesoft.co.uk/user32.dll/IsServerSideWindow.php