Leak the window when it closes on Windows 10 (#15397)

Re: #15384

Basically, when we close a `DesktopWindowXamlSource`, it calls to `Windows_UI_Xaml!DirectUI::MetadataAPI::Reset`, which resets the XAML metadata provider _for the process_. So, closing one DWXS on one thread will force an A/V next time another thread tries to do something like... display a tooltip. Not immediately, but surely soon enough.

This was fixed in Windows 11 by os.2020!5837001. That wasn't backported to Windows 10.

This will cause a ~15MB memory leak PER WINDOW. OBVIOUSLY, this is bad, but it's less bad than crashing.

We're gonna keep using #15384 for other ideas here too.

(cherry picked from commit c589784)
Service-Card-Id: 89283538
Service-Version: 1.18

src/cascadia/WindowsTerminal/IslandWindow.cpp

@@ -42,6 +42,46 @@ IslandWindow::~IslandWindow()
 
 void IslandWindow::Close()
 {
+ static const bool isWindows11 = []() {
+ OSVERSIONINFOEXW osver{};
+ osver.dwOSVersionInfoSize = sizeof(osver);
+ osver.dwBuildNumber = 22000;
+
+ DWORDLONG dwlConditionMask = 0;
+ VER_SET_CONDITION(dwlConditionMask, VER_BUILDNUMBER, VER_GREATER_EQUAL);
+
+ if (VerifyVersionInfoW(&osver, VER_BUILDNUMBER, dwlConditionMask) != FALSE)
+ {
+ return true;
+ }
+ return false;
+ }();
+
+ if (!isWindows11)
+ {
+ // BODGY
+ // ____ ____ _____ _______ __
+ // | _ \ / __ \| __ \ / ____\ \ / /
+ // | |_) | | | | | | | | __ \ \_/ /
+ // | _ <| | | | | | | | |_ | \ /
+ // | |_) | |__| | |__| | |__| | | |
+ // |____/ \____/|_____/ \_____| |_|
+ //
+ // There's a bug in Windows 10 where closing a DesktopWindowXamlSource
+ // on any thread will free an internal static resource that's used by
+ // XAML for the entire process. This would result in closing window
+ // essentially causing the entire app to crash.
+ //
+ // To avoid this, leak the XAML island. We only need to leak this on
+ // Windows 10, since the bug is fixed in Windows 11.
+ //
+ // See GH #15384, MSFT:32109540
+ auto a{ _source };
+ winrt::detach_abi(_source);
+
+ // </BODGY>
+ }
+
  if (_source)
  {
  _source.Close();