user32:clipboard winex11.drv (KDE) interference

[Esme Povirk (they/them)]

I found some references to this problem on Windows:

https://stackoverflow.com/questions/68666/clipbrd-e-cant-open-error-when-setting-the-clipboard-from-net

https://techcommunity.microsoft.com/t5/security-compliance-and-identity/why-does-my-shared-clipboard-not-work-part-2/ba-p/246465

This says that a mechanism was added to allow Terminal Services to
enumerate formats without opening the clipboard. I think this is the
AddClipboardFormatListener function. Unfortunately, that doesn't help
much with winex11 since it doesn't let us read the data.