linux: Fix IME panel position while enumerating input methods (#12495)

Release Notes:

- N/A

This updates the IME position every time the selection changes, this is
probably only useful when you enumerate languages with your IME.

TODO:
- ~There is a rare chance that the ime panel is not updated because the
window input handler is None.~
- ~Update IME panel in vim mode.~
- ~Update IME panel when leaving Buffer search input.~

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>

crates/gpui/src/platform/linux/wayland/client.rs

@@ -312,6 +312,23 @@ impl WaylandClientStatePtr {
         }
     }
 
+    pub fn update_ime_position(&self, bounds: Bounds<Pixels>) {
+        let client = self.get_client();
+        let mut state = client.borrow_mut();
+        if state.composing || state.text_input.is_none() {
+            return;
+        }
+
+        let text_input = state.text_input.as_ref().unwrap();
+        text_input.set_cursor_rectangle(
+            bounds.origin.x.0 as i32,
+            bounds.origin.y.0 as i32,
+            bounds.size.width.0 as i32,
+            bounds.size.height.0 as i32,
+        );
+        text_input.commit();
+    }
+
     pub fn drop_window(&self, surface_id: &ObjectId) {
         let mut client = self.get_client();
         let mut state = client.borrow_mut();
@@ -1353,6 +1370,7 @@ impl Dispatch<zwp_text_input_v3::ZwpTextInputV3, ()> for WaylandClientStatePtr {
                         }
                     }
                 } else {
+                    state.composing = false;
                     drop(state);
                     window.handle_ime(ImeInput::DeleteText);
                 }