Termonad is using the colour library to define things like cursor colors, terminal background colors, etc.

In particular, Termonad is using the Colour type.

These Colour types are converted to an RGBA from gi-gdk in the following function:

However, the Colour type doesn't actually have an associated alpha value, so we must use 1.

It would be more correct to use the AlphaColour throughout the Termonad codebase instead of Colour.

This would be a relatively simple change. You'd basically just have to change all the uses of Colour to AlphaColour in https://github.com/cdepillabout/termonad/blob/3776e6392dd0a613f6b9e3ea85b85fe97815f685/src/Termonad/Config/Colour.hs, and then fix all the type errors.