I looked and Sigil 1.6 is quite old from early 2021. In Sigil version 1.8 (late 2021) we made deadkey and altgr related changes specific to Windows.
Perhaps those are an issue?
The altgr setting can be enabled/disabled in a Preference setting, right?
If they try Sigil 1.8 and it exhibits the same issues as Sigil-2.0.2 then we will know the issue is not Qt6 related as Sigil 1.8 still used Qt5.
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