config: add mouse-follows-focus option

jay-config/src/_private/client.rs

@@ -1108,6 +1108,10 @@ impl ConfigClient {
         self.send(&ClientMessage::SeatEnableUnicodeInput { seat });
     }
 
+    pub fn seat_set_mouse_follows_focus(&self, seat: Seat, enabled: bool) {
+        self.send(&ClientMessage::SeatSetMouseFollowsFocus { seat, enabled });
+    }
+
     pub fn set_show_float_pin_icon(&self, show: bool) {
         self.send(&ClientMessage::SetShowFloatPinIcon { show });
     }

jay-config/src/_private/ipc.rs

@@ -871,6 +871,10 @@ pub enum ClientMessage<'a> {
         dx2: i32,
         dy2: i32,
     },
+    SeatSetMouseFollowsFocus {
+        seat: Seat,
+        enabled: bool,
+    },
 }
 
 #[derive(Serialize, Deserialize, Debug)]

jay-config/src/input.rs

@@ -655,6 +655,15 @@ impl Seat {
     pub fn resize(self, dx1: i32, dy1: i32, dx2: i32, dy2: i32) {
         self.window().resize(dx1, dy1, dx2, dy2);
     }
+
+    /// Sets whether the cursor should automatically move to the center of a window
+    /// when focus changes via keyboard commands (move-left, focus-right, show-workspace, etc.).
+    ///
+    /// The default is `false`.
+    #[deprecated = "This setting is unstable and might be removed in the future"]
+    pub fn unstable_set_mouse_follows_focus(self, enabled: bool) {
+        get!().seat_set_mouse_follows_focus(self, enabled)
+    }
 }
 
 /// A focus-follows-mouse mode.