If I remember correctly, Wayland forbids to listen to keyboard inputs for security reasons. Each software receives its input, but there is no global listening.
So, in my understanding, this could mean that it's not possible.
this post was submitted on 20 Apr 2025
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Wayland supports global shortcuts using the global shortcuts portal, so it should be possible. There's an app called espanso that automatically expands text on Wayland, I imagine similar methods could be used for this.
I didn't know about global shortcut portal, that's interesting.
Thank you for your input, I've learned something today.
For X11 it could be possible. And Implementing it into the Compositor could be possible too
It looks like this works by following accessibility standards. I'm not sure if an accessibility standard for input fields on Linux, but if it does it should be possible.