Ei protocol support

- Use the configured keyboard layout, track ei seats to reconfigure their keyboards
- DBus interface
- Disambiguate input devices per backend instance
- Add support for `ei_keysym` and `ei_text`
- Act as input method for ei_text UTF-8 injection
- Create a region per output for abosolute pointer position
- Map ei region for touchscreen emulation
- Release pointer buttons and keys on removal
- Send modifiers to EI connections

src/shell/layout/tiling/grabs/swap.rs

@@ -13,6 +13,7 @@ use smithay::{
 
 use crate::{
     config::key_bindings::cosmic_modifiers_from_smithay,
+    input::InputBackendId,
     shell::{Trigger, layout::tiling::NodeDesc},
     state::State,
 };
@@ -73,6 +74,7 @@ impl KeyboardGrab<State> for SwapWindowGrab {
 
         data.handle_shortcut_action(
             shortcuts::Action::Focus(direction),
+            &InputBackendId::Normal,
             &self.seat,
             serial,
             time,