add toggle focus between floating and tiled layers

Adds focus_floats(), toggle_focus_float_tiled(), and their IPC
bindings so users can bind a key to swap focus between the floating
and tiled layers.

jay-config/src/_private/client.rs

@@ -399,6 +399,14 @@ impl ConfigClient {
         self.send(&ClientMessage::SeatFocusTiles { seat });
     }
 
+    pub fn seat_focus_floats(&self, seat: Seat) {
+        self.send(&ClientMessage::SeatFocusFloats { seat });
+    }
+
+    pub fn seat_toggle_focus_float_tiled(&self, seat: Seat) {
+        self.send(&ClientMessage::SeatToggleFocusFloatTiled { seat });
+    }
+
     pub fn seat_focus(&self, seat: Seat, direction: Direction) {
         self.send(&ClientMessage::SeatFocus { seat, direction });
     }

jay-config/src/_private/ipc.rs

@@ -747,6 +747,12 @@ pub enum ClientMessage<'a> {
     SeatFocusTiles {
         seat: Seat,
     },
+    SeatFocusFloats {
+        seat: Seat,
+    },
+    SeatToggleFocusFloatTiled {
+        seat: Seat,
+    },
     SetMiddleClickPasteEnabled {
         enabled: bool,
     },

jay-config/src/input.rs

@@ -321,6 +321,19 @@ impl Seat {
         get!().seat_focus_tiles(self)
     }
 
+    /// Moves the keyboard focus to the topmost floating window.
+    pub fn focus_floats(self) {
+        get!().seat_focus_floats(self)
+    }
+
+    /// Toggles keyboard focus between the floating and tiled layers.
+    ///
+    /// If focus is on the tiled or fullscreen layer, focus moves to the topmost float.
+    /// If focus is on the floating layer, focus moves to the tiled layer.
+    pub fn toggle_focus_float_tiled(self) {
+        get!().seat_toggle_focus_float_tiled(self)
+    }
+
     /// Moves the keyboard focus of the seat in the specified direction.
     pub fn focus(self, direction: Direction) {
         get!().seat_focus(self, direction)