Do not activate inactive tabs when pinning or unpinning

Closes https://github.com/zed-industries/zed/issues/32024

Release Notes:

- Fixed a bug where inactive tabs would be activated when pinning or
unpinning.

crates/debugger_ui/src/session/running.rs

@@ -286,6 +286,7 @@ pub(crate) fn new_debugger_pane(
                                 &new_pane,
                                 item_id_to_move,
                                 new_pane.read(cx).active_item_index(),
+                                true,
                                 window,
                                 cx,
                             );

crates/terminal_view/src/terminal_panel.rs

@@ -1062,6 +1062,7 @@ pub fn new_terminal_pane(
                                             &new_pane,
                                             item_id_to_move,
                                             new_pane.read(cx).active_item_index(),
+                                            true,
                                             window,
                                             cx,
                                         );

crates/workspace/src/pane.rs

@@ -402,6 +402,12 @@ pub enum Side {
     Right,
 }
 
+#[derive(Copy, Clone)]
+enum PinOperation {
+    Pin,
+    Unpin,
+}
+
 impl Pane {
     pub fn new(
         workspace: WeakEntity<Workspace>,
@@ -2099,53 +2105,66 @@ impl Pane {
     }
 
     fn pin_tab_at(&mut self, ix: usize, window: &mut Window, cx: &mut Context<Self>) {
+        self.change_tab_pin_state(ix, PinOperation::Pin, window, cx);
+    }
+
+    fn unpin_tab_at(&mut self, ix: usize, window: &mut Window, cx: &mut Context<Self>) {
+        self.change_tab_pin_state(ix, PinOperation::Unpin, window, cx);
+    }
+
+    fn change_tab_pin_state(
+        &mut self,
+        ix: usize,
+        operation: PinOperation,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
         maybe!({
             let pane = cx.entity().clone();
-            let destination_index = self.pinned_tab_count.min(ix);
-            self.pinned_tab_count += 1;
-            let id = self.item_for_index(ix)?.item_id();
 
-            if self.is_active_preview_item(id) {
+            let destination_index = match operation {
+                PinOperation::Pin => self.pinned_tab_count.min(ix),
+                PinOperation::Unpin => self.pinned_tab_count.checked_sub(1)?,
+            };
+
+            let id = self.item_for_index(ix)?.item_id();
+            let should_activate = ix == self.active_item_index;
+
+            if matches!(operation, PinOperation::Pin) && self.is_active_preview_item(id) {
                 self.set_preview_item_id(None, cx);
             }
 
+            match operation {
+                PinOperation::Pin => self.pinned_tab_count += 1,
+                PinOperation::Unpin => self.pinned_tab_count -= 1,
+            }
+
             if ix == destination_index {
                 cx.notify();
             } else {
                 self.workspace
                     .update(cx, |_, cx| {
                         cx.defer_in(window, move |_, window, cx| {
-                            move_item(&pane, &pane, id, destination_index, window, cx)
+                            move_item(
+                                &pane,
+                                &pane,
+                                id,
+                                destination_index,
+                                should_activate,
+                                window,
+                                cx,
+                            );
                         });
                     })
                     .ok()?;
             }
-            cx.emit(Event::ItemPinned);
 
-            Some(())
-        });
-    }
+            let event = match operation {
+                PinOperation::Pin => Event::ItemPinned,
+                PinOperation::Unpin => Event::ItemUnpinned,
+            };
 
-    fn unpin_tab_at(&mut self, ix: usize, window: &mut Window, cx: &mut Context<Self>) {
-        maybe!({
-            let pane = cx.entity().clone();
-            self.pinned_tab_count = self.pinned_tab_count.checked_sub(1)?;
-            let destination_index = self.pinned_tab_count;
-
-            let id = self.item_for_index(ix)?.item_id();
-
-            if ix == destination_index {
-                cx.notify()
-            } else {
-                self.workspace
-                    .update(cx, |_, cx| {
-                        cx.defer_in(window, move |_, window, cx| {
-                            move_item(&pane, &pane, id, destination_index, window, cx)
-                        });
-                    })
-                    .ok()?;
-            }
-            cx.emit(Event::ItemUnpinned);
+            cx.emit(event);
 
             Some(())
         });
@@ -2898,7 +2917,7 @@ impl Pane {
                             })
                         }
                     } else {
-                        move_item(&from_pane, &to_pane, item_id, ix, window, cx);
+                        move_item(&from_pane, &to_pane, item_id, ix, true, window, cx);
                     }
                     if to_pane == from_pane {
                         if let Some(old_index) = old_ix {
@@ -4006,13 +4025,13 @@ mod tests {
             let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
             pane.pin_tab_at(ix, window, cx);
         });
-        assert_item_labels(&pane, ["C!", "B*!", "A"], cx);
+        assert_item_labels(&pane, ["C*!", "B!", "A"], cx);
 
         pane.update_in(cx, |pane, window, cx| {
             let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
             pane.pin_tab_at(ix, window, cx);
         });
-        assert_item_labels(&pane, ["C!", "B*!", "A!"], cx);
+        assert_item_labels(&pane, ["C*!", "B!", "A!"], cx);
     }
 
     #[gpui::test]
@@ -4161,6 +4180,151 @@ mod tests {
         assert_item_labels(&pane, ["B*", "A", "C"], cx);
     }
 
+    #[gpui::test]
+    async fn test_pinning_active_tab_without_position_change_maintains_focus(
+        cx: &mut TestAppContext,
+    ) {
+        init_test(cx);
+        let fs = FakeFs::new(cx.executor());
+
+        let project = Project::test(fs, None, cx).await;
+        let (workspace, cx) =
+            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
+        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
+
+        // Add A
+        let item_a = add_labeled_item(&pane, "A", false, cx);
+        assert_item_labels(&pane, ["A*"], cx);
+
+        // Add B
+        add_labeled_item(&pane, "B", false, cx);
+        assert_item_labels(&pane, ["A", "B*"], cx);
+
+        // Activate A again
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
+            pane.activate_item(ix, true, true, window, cx);
+        });
+        assert_item_labels(&pane, ["A*", "B"], cx);
+
+        // Pin A - remains active
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
+            pane.pin_tab_at(ix, window, cx);
+        });
+        assert_item_labels(&pane, ["A*!", "B"], cx);
+
+        // Unpin A - remain active
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
+            pane.unpin_tab_at(ix, window, cx);
+        });
+        assert_item_labels(&pane, ["A*", "B"], cx);
+    }
+
+    #[gpui::test]
+    async fn test_pinning_active_tab_with_position_change_maintains_focus(cx: &mut TestAppContext) {
+        init_test(cx);
+        let fs = FakeFs::new(cx.executor());
+
+        let project = Project::test(fs, None, cx).await;
+        let (workspace, cx) =
+            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
+        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
+
+        // Add A, B, C
+        add_labeled_item(&pane, "A", false, cx);
+        add_labeled_item(&pane, "B", false, cx);
+        let item_c = add_labeled_item(&pane, "C", false, cx);
+        assert_item_labels(&pane, ["A", "B", "C*"], cx);
+
+        // Pin C - moves to pinned area, remains active
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
+            pane.pin_tab_at(ix, window, cx);
+        });
+        assert_item_labels(&pane, ["C*!", "A", "B"], cx);
+
+        // Unpin C - moves after pinned area, remains active
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
+            pane.unpin_tab_at(ix, window, cx);
+        });
+        assert_item_labels(&pane, ["C*", "A", "B"], cx);
+    }
+
+    #[gpui::test]
+    async fn test_pinning_inactive_tab_without_position_change_preserves_existing_focus(
+        cx: &mut TestAppContext,
+    ) {
+        init_test(cx);
+        let fs = FakeFs::new(cx.executor());
+
+        let project = Project::test(fs, None, cx).await;
+        let (workspace, cx) =
+            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
+        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
+
+        // Add A, B
+        let item_a = add_labeled_item(&pane, "A", false, cx);
+        add_labeled_item(&pane, "B", false, cx);
+        assert_item_labels(&pane, ["A", "B*"], cx);
+
+        // Pin A - already in pinned area, B remains active
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
+            pane.pin_tab_at(ix, window, cx);
+        });
+        assert_item_labels(&pane, ["A!", "B*"], cx);
+
+        // Unpin A - stays in place, B remains active
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_a.item_id()).unwrap();
+            pane.unpin_tab_at(ix, window, cx);
+        });
+        assert_item_labels(&pane, ["A", "B*"], cx);
+    }
+
+    #[gpui::test]
+    async fn test_pinning_inactive_tab_with_position_change_preserves_existing_focus(
+        cx: &mut TestAppContext,
+    ) {
+        init_test(cx);
+        let fs = FakeFs::new(cx.executor());
+
+        let project = Project::test(fs, None, cx).await;
+        let (workspace, cx) =
+            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));
+        let pane = workspace.read_with(cx, |workspace, _| workspace.active_pane().clone());
+
+        // Add A, B, C
+        add_labeled_item(&pane, "A", false, cx);
+        let item_b = add_labeled_item(&pane, "B", false, cx);
+        let item_c = add_labeled_item(&pane, "C", false, cx);
+        assert_item_labels(&pane, ["A", "B", "C*"], cx);
+
+        // Activate B
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_b.item_id()).unwrap();
+            pane.activate_item(ix, true, true, window, cx);
+        });
+        assert_item_labels(&pane, ["A", "B*", "C"], cx);
+
+        // Pin C - moves to pinned area, B remains active
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
+            pane.pin_tab_at(ix, window, cx);
+        });
+        assert_item_labels(&pane, ["C!", "A", "B*"], cx);
+
+        // Unpin C - moves after pinned area, B remains active
+        pane.update_in(cx, |pane, window, cx| {
+            let ix = pane.index_for_item_id(item_c.item_id()).unwrap();
+            pane.unpin_tab_at(ix, window, cx);
+        });
+        assert_item_labels(&pane, ["C", "A", "B*"], cx);
+    }
+
     #[gpui::test]
     async fn test_add_item_with_new_item(cx: &mut TestAppContext) {
         init_test(cx);

crates/workspace/src/workspace.rs

@@ -3820,7 +3820,7 @@ impl Workspace {
         };
 
         let new_pane = self.add_pane(window, cx);
-        move_item(&from, &new_pane, item_id_to_move, 0, window, cx);
+        move_item(&from, &new_pane, item_id_to_move, 0, true, window, cx);
         self.center
             .split(&pane_to_split, &new_pane, split_direction)
             .unwrap();
@@ -7515,6 +7515,7 @@ pub fn move_item(
     destination: &Entity<Pane>,
     item_id_to_move: EntityId,
     destination_index: usize,
+    activate: bool,
     window: &mut Window,
     cx: &mut App,
 ) {
@@ -7538,8 +7539,18 @@ pub fn move_item(
 
     // This automatically removes duplicate items in the pane
     destination.update(cx, |destination, cx| {
-        destination.add_item(item_handle, true, true, Some(destination_index), window, cx);
-        window.focus(&destination.focus_handle(cx))
+        destination.add_item_inner(
+            item_handle,
+            activate,
+            activate,
+            activate,
+            Some(destination_index),
+            window,
+            cx,
+        );
+        if activate {
+            window.focus(&destination.focus_handle(cx))
+        }
     });
 }