fix: skip unchanged status command renders

src/app/api.rs

@@ -64,6 +64,11 @@ impl App {
                 results,
                 cache_updates,
             } => self.handle_git_status_refreshed(results, cache_updates),
+            AppEvent::TabBarCommandFinished {
+                generation,
+                segment_index,
+                result,
+            } => self.handle_tab_bar_command_finished(generation, segment_index, result),
             ev @ AppEvent::TerminalBell { .. } => {
                 self.handle_internal_event(ev);
                 false
@@ -150,7 +155,7 @@ impl App {
             result,
         } = ev
         {
-            self.handle_tab_bar_command_finished(generation, segment_index, result);
+            let _ = self.handle_tab_bar_command_finished(generation, segment_index, result);
             return;
         }
 

src/app/mod.rs

@@ -2351,6 +2351,37 @@ mod tests {
         assert!(!app.git_refresh_in_flight);
     }
 
+    #[test]
+    fn tab_bar_command_events_render_only_when_visible_output_changes() {
+        if !crate::platform::status_commands_supported() {
+            return;
+        }
+
+        let mut app = test_app();
+        app.configure_tab_bar_status(
+            &[crate::config::TabBarRightEntryConfig::Command {
+                command: "status".into(),
+                interval_seconds: 5,
+                timeout_seconds: 2,
+            }],
+            " ",
+        );
+        let generation = app.tab_bar_status_generation;
+        let event = |generation, output: Option<&str>| AppEvent::TabBarCommandFinished {
+            generation,
+            segment_index: 0,
+            result: Ok(output.map(str::to_string)),
+        };
+
+        assert!(!app.handle_internal_event_with_prefix_sync(event(generation, None)));
+        assert!(app.handle_internal_event_with_prefix_sync(event(generation, Some("ready"))));
+        assert!(!app.handle_internal_event_with_prefix_sync(event(generation, Some("ready"))));
+        assert!(!app.handle_internal_event_with_prefix_sync(event(
+            generation.wrapping_add(1),
+            Some("stale"),
+        )));
+    }
+
     #[test]
     fn git_status_event_clears_in_flight_refresh() {
         let mut app = test_app();

src/app/tab_bar_status.rs

@@ -174,16 +174,16 @@ impl App {
         generation: u64,
         segment_index: usize,
         result: Result<Option<String>, String>,
-    ) {
+    ) -> bool {
         if generation != self.tab_bar_status_generation {
-            return;
+            return false;
         }
         let Some(runtime) = self
             .tab_bar_commands
             .iter_mut()
             .find(|runtime| runtime.segment_index == segment_index)
         else {
-            return;
+            return false;
         };
         runtime.task = None;
 
@@ -194,11 +194,14 @@ impl App {
                 None
             }
         };
-        if let Some(TabBarStatusSegment::Text(current)) =
+        let Some(TabBarStatusSegment::Text(current)) =
             self.state.tab_bar_right.get_mut(segment_index)
-        {
-            *current = output;
-        }
+        else {
+            return false;
+        };
+        let changed = *current != output;
+        *current = output;
+        changed
     }
 }