Certain Keyboard Layouts Require a Right Alt Key to Type Certain Characters

Distribution

Fedora 40 t2

Package version

Cinnamon 6.2.9

Graphics hardware in use

Intel Corporation CoffeeLake-H GT2 [UHD Graphics 630]

Frequency

Always

Bug description

I'm currently using the English International keyboard, with AltGr Dead Keys.

If I don't remap any keys, then it is possible to type letters such as þ using combos such as Right Alt + T. But I can't type 2-handed, so that only works in the middle and right of the keyboard.

If I swap the Left Alt and Left Control keys, and Right Alt and Right Control keys, (in the Keyboard Options), I can't type those letters with either Control key. Both Control keys are treated as Left Alt keys.

Steps to reproduce

1. Use a layout where the right alt key allows additional letters.
2. Check that the right alt key allows these letters, but the left alt key does not.
3. Open Keyboard > Layouts > Options > Control Position and enable "Swap Right Alt with Right Control."
4. See if the right control key allows these letters.

Expected behavior

1. There should be a way to make both alt keys allow these letters.
2. If users swap the alt and control keys, then there should be a way to make each control key should allow these letters.

Additional information

Using a Periboard 409 usb keyboard.

Start in Cinnamon's Keyboard > Layouts > Options > Control Position settings and reproduce the issue with Fedora 40, Cinnamon 6.2.9, and an English International AltGr Dead Keys layout. Trace how the swapped Alt and Control keys are handled; done means both Alt keys, or both remapped Control keys, can produce the layout's additional characters.