git_graph: Focus search editor on open (#63002)

Release Notes:

- The git graph and git history view will now focus the search editor on
initial focus

crates/git_ui/src/git_graph.rs

@@ -4108,8 +4108,8 @@ impl Render for GitGraph {
 impl EventEmitter<ItemEvent> for GitGraph {}
 
 impl Focusable for GitGraph {
-    fn focus_handle(&self, _cx: &App) -> FocusHandle {
-        self.focus_handle.clone()
+    fn focus_handle(&self, cx: &App) -> FocusHandle {
+        self.search_state.editor.read(cx).focus_handle(cx)
     }
 }
 
@@ -6449,6 +6449,61 @@ mod tests {
         });
     }
 
+    #[gpui::test]
+    async fn test_focus_handle_focuses_search_editor(cx: &mut TestAppContext) {
+        init_test(cx);
+
+        let fs = FakeFs::new(cx.executor());
+        fs.insert_tree(
+            Path::new("/project"),
+            serde_json::json!({
+                ".git": {},
+                "file.txt": "content",
+            }),
+        )
+        .await;
+
+        let project = Project::test(fs.clone(), [Path::new("/project")], cx).await;
+        cx.run_until_parked();
+
+        let repository = project.read_with(cx, |project, cx| {
+            project
+                .active_repository(cx)
+                .expect("should have a repository")
+        });
+
+        let (multi_workspace, cx) = cx.add_window_view(|window, cx| {
+            workspace::MultiWorkspace::test_new(project.clone(), window, cx)
+        });
+        let workspace_weak =
+            multi_workspace.read_with(&*cx, |multi, _| multi.workspace().downgrade());
+
+        let git_graph = cx.new_window_entity(|window, cx| {
+            GitGraph::new(
+                repository.read(cx).id,
+                project.read(cx).git_store().clone(),
+                workspace_weak,
+                None,
+                window,
+                cx,
+            )
+        });
+        cx.run_until_parked();
+
+        git_graph.update_in(cx, |graph, window, cx| {
+            window.focus(&graph.focus_handle(cx), cx);
+            assert!(
+                graph
+                    .search_state
+                    .editor
+                    .read(cx)
+                    .focus_handle(cx)
+                    .is_focused(window),
+                "focusing the git graph item should focus the search editor"
+            );
+        });
+    }
+
     #[gpui::test]
     async fn test_row_height_matches_uniform_list_item_height(cx: &mut TestAppContext) {
         init_test(cx);