Fetch code actions on cursor movement instead of on-demand

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/gpui/src/presenter.rs

@@ -7,7 +7,8 @@ use crate::{
     platform::Event,
     text_layout::TextLayoutCache,
     Action, AnyAction, AnyViewHandle, AssetCache, ElementBox, Entity, FontSystem, ModelHandle,
-    ReadModel, ReadView, Scene, View, ViewHandle,
+    ReadModel, ReadView, Scene, UpgradeModelHandle, UpgradeViewHandle, View, ViewHandle,
+    WeakModelHandle, WeakViewHandle,
 };
 use pathfinder_geometry::vector::{vec2f, Vector2F};
 use serde_json::json;
@@ -270,6 +271,21 @@ impl<'a> ReadModel for LayoutContext<'a> {
     }
 }
 
+impl<'a> UpgradeModelHandle for LayoutContext<'a> {
+    fn upgrade_model_handle<T: Entity>(
+        &self,
+        handle: &WeakModelHandle<T>,
+    ) -> Option<ModelHandle<T>> {
+        self.app.upgrade_model_handle(handle)
+    }
+}
+
+impl<'a> UpgradeViewHandle for LayoutContext<'a> {
+    fn upgrade_view_handle<T: View>(&self, handle: &WeakViewHandle<T>) -> Option<ViewHandle<T>> {
+        self.app.upgrade_view_handle(handle)
+    }
+}
+
 pub struct PaintContext<'a> {
     rendered_views: &'a mut HashMap<usize, ElementBox>,
     pub scene: &'a mut Scene,