I can't get spellchecking to work on windows platform with CefSharp minimal example. I'm aware of this post:
viewtopic.php?f=6&t=18269&p=50206&hilit=spellcheck#p50206
and added this line in minimal example
settings.CefCommandLineArgs.Add("--disable-features","CalculateNativeWinOcclusion,WinUseBrowserSpellChecker");
(I tried without -- and only WinUseBrowserSpellChecker but to no avail)
chrome://versions shows this command line:
"C:\import\CefSharp.MinimalExample-master\CefSharp.MinimalExample.WinForms\bin.net472\Debug\net472\CefSharp.MinimalExample.WinForms.net472.exe" --browser-subprocess-path="C:\import\CefSharp.MinimalExample-master\CefSharp.MinimalExample.WinForms\bin.net472\Debug\net472\x64\CefSharp.BrowserSubprocess.exe" --no-sandbox --lang=en-US --log-file="c:\logs\cefsharp638626982442714674.log" --log-severity=verbose --disable-features=EnableHangWatcher --disable-chrome-login-prompt --enable-media-stream --use-fake-ui-for-media-stream --enable-usermedia-screen-capturing --disable-features=CalculateNativeWinOcclusion,WinUseBrowserSpellChecker --flag-switches-begin --flag-switches-end
There are two "disable-features" options in command line, mine and EnableHangWatcher. This seems to be part of libcef. Not sure if this is the reason for this problem.
If it is required to complile libcef with this option I also take hints on where to set that switch

Any hints appreciated. Regards.
update2: use_browser_spellchecker=false in GN_DEFINES is not a valid option