Xorg/DE always handles some keyboard/mouse input events rather than the currently focused window, which is useful, but I want to make an exception for a particular app (because reasons).
That is, is it possible to either execute or code an app in such a way that it captures and handles all input (while open and focused)?
A black hole for all inputs if you will, no input can escape the window.
E.g. Ctrl+Alt F3 exits the DE and enters a virtual console, I don't want that to happen when I'm running this app, I want the app to handle that input (and do nothing with it), while Xorg/DE knowing nothing about it.