[KevinH]

I truly think this is an issue between Qt and the Korean IME on Windows that we (Sigil) can not fix.

Perhaps there are some settings on Windows that can control the colour used when precomposing a sequence of key inputs into the final Korean letter. This is not something that Sigil can control as far as I can tell.

Until the character is completely formed, why is the IME showing anything at all? There should be a separate input field someplace else (a pop-up maybe) that shows the key sequence input so far before the final character is formed.

I recommend filing an issue directly with Qt about what you are seeing.

Or perhaps trying a third party Korean IME to see if it has the same issues.