perf: eliminate repeated workspace git discovery (#1842)

* perf: eliminate repeated workspace git discovery

refs #1838

* fix: keep workspace labels current without extra redraws

refs #1838

* fix: retain discovered workspace git metadata

refs #1838

1 files changed, 56 insertions, 4 deletions

diff --git a/src/server/headless.rs b/src/server/headless.rs
index 942a17f1..99702512 100644
--- a/src/server/headless.rs
+++ b/src/server/headless.rs
@@ -2272,10 +2272,7 @@ impl HeadlessServer {
 
                 true
             }
-            _ => {
-                self.app.handle_internal_event(ev);
-                true
-            }
+            _ => self.app.handle_internal_event_with_render_impact(ev),
         }
     }
 
@@ -5584,6 +5581,61 @@ next_tab = ""
     }
 
     #[test]
+    fn unchanged_git_refresh_does_not_request_headless_render() {
+        let mut server = test_headless_server();
+        server.app.git_refresh_in_flight = true;
+        let mut workspace = crate::workspace::Workspace::test_new("one");
+        let workspace_id = workspace.id.clone();
+        let cwd = workspace.identity_cwd.clone();
+        workspace.cached_auto_label = "cached".into();
+        workspace.cached_git_status_key = cwd.clone();
+        workspace.cached_git_branch = None;
+        server.app.state.workspaces.push(workspace);
+
+        let changed = server.handle_internal_event_with_forwarding(AppEvent::GitStatusRefreshed {
+            results: vec![crate::workspace::WorkspaceGitStatus {
+                workspace_id,
+                resolved_identity_cwd: cwd.clone(),
+                status_cache_key: cwd,
+                demand: crate::workspace::GitStatusRefreshDemand::ALL,
+                auto_label: "cached".into(),
+                branch: None,
+                ahead_behind: None,
+                space: None,
+            }],
+            cache_updates: Vec::new(),
+        });
+
+        assert!(!changed);
+        assert!(!server.app.git_refresh_in_flight);
+    }
+
+    #[test]
+    fn changed_git_refresh_requests_headless_render() {
+        let mut server = test_headless_server();
+        let workspace = crate::workspace::Workspace::test_new("one");
+        let workspace_id = workspace.id.clone();
+        let cwd = workspace.identity_cwd.clone();
+        server.app.state.workspaces.push(workspace);
+
+        let changed = server.handle_internal_event_with_forwarding(AppEvent::GitStatusRefreshed {
+            results: vec![crate::workspace::WorkspaceGitStatus {
+                workspace_id,
+                resolved_identity_cwd: cwd.clone(),
+                status_cache_key: cwd,
+                demand: crate::workspace::GitStatusRefreshDemand::ALL,
+                auto_label: "one".into(),
+                branch: Some("changed".into()),
+                ahead_behind: None,
+                space: None,
+            }],
+            cache_updates: Vec::new(),
+        });
+
+        assert!(changed);
+    }
+
+    #[test]
     fn terminal_attach_client_exits_when_attached_pane_dies() {
         let mut server = test_headless_server();
         let workspace = crate::workspace::Workspace::test_new("attached");