Fix double clicking objects no longer focusing the camera on them (#2227

)

_Requires #2188_ ✔️ 

Fixes #2215 
* #2215 

### What

### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)

<!-- This line will get updated when the PR build summary job finishes.
-->
PR Build Summary: https://build.rerun.io/pr/2227

crates/re_viewport/src/view_spatial/ui_3d.rs

@@ -44,9 +44,6 @@ pub struct View3DState {
 
     eye_interpolation: Option<EyeInterpolation>,
 
-    /// Where in world space the mouse is hovering (from previous frame)
-    hovered_point: Option<glam::Vec3>,
-
     // options:
     pub spin: bool,
     pub show_axes: bool,
@@ -65,7 +62,6 @@ impl Default for View3DState {
             tracked_camera: None,
             camera_before_tracked_camera: None,
             eye_interpolation: Default::default(),
-            hovered_point: Default::default(),
             spin: false,
             show_axes: false,
             show_bbox: false,
@@ -396,8 +392,9 @@ pub fn view_3d(
         );
     }
 
-    // Double click changes camera
+    // Double click changes camera to focus on an entity.
     if response.double_clicked() {
+        // Clear out tracked camera if there's any.
         state.state_3d.tracked_camera = None;
         state.state_3d.camera_before_tracked_camera = None;
 
@@ -408,13 +405,17 @@ pub fn view_3d(
                     state.state_3d.orbit_eye.map(|eye| eye.to_eye());
                 state.state_3d.interpolate_to_eye(camera);
                 state.state_3d.tracked_camera = Some(instance_path.entity_path.clone());
-            } else if let Some(clicked_point) = state.state_3d.hovered_point {
+            } else if let HoveredSpace::ThreeD {
+                pos: Some(clicked_point),
+                ..
+            } = ctx.selection_state().hovered_space()
+            {
                 if let Some(mut new_orbit_eye) = state.state_3d.orbit_eye {
                     // TODO(andreas): It would be nice if we could focus on the center of the entity rather than the clicked point.
                     //                  We can figure out the transform/translation at the hovered path but that's usually not what we'd expect either
                     //                  (especially for entities with many instances, like a point cloud)
-                    new_orbit_eye.orbit_radius = new_orbit_eye.position().distance(clicked_point);
-                    new_orbit_eye.orbit_center = clicked_point;
+                    new_orbit_eye.orbit_radius = new_orbit_eye.position().distance(*clicked_point);
+                    new_orbit_eye.orbit_center = *clicked_point;
                     state.state_3d.interpolate_to_orbit_eye(new_orbit_eye);
                 }
             }