1 files changed, 120 insertions, 0 deletions
diff --git a/src/app/actions.rs b/src/app/actions.rs
index 0709ed4c..10d28054 100644
--- a/src/app/actions.rs
+++ b/src/app/actions.rs
@@ -1390,6 +1390,73 @@ impl AppState {
         true
     }
 
+    pub fn move_workspace_block(
+        &mut self,
+        workspace_ids: &[String],
+        before_workspace_id: Option<&str>,
+    ) -> bool {
+        let moved_ids = workspace_ids
+            .iter()
+            .map(String::as_str)
+            .collect::<std::collections::HashSet<_>>();
+        if moved_ids.is_empty()
+            || moved_ids.len() != workspace_ids.len()
+            || !workspace_ids
+                .iter()
+                .all(|id| self.workspaces.iter().any(|workspace| workspace.id == *id))
+            || before_workspace_id.is_some_and(|id| {
+                moved_ids.contains(id)
+                    || !self.workspaces.iter().any(|workspace| workspace.id == id)
+            })
+        {
+            return false;
+        }
+
+        let mut desired_ids = self
+            .workspaces
+            .iter()
+            .filter(|workspace| !moved_ids.contains(workspace.id.as_str()))
+            .map(|workspace| workspace.id.clone())
+            .collect::<Vec<_>>();
+        let insert_idx = before_workspace_id
+            .and_then(|id| desired_ids.iter().position(|candidate| candidate == id))
+            .unwrap_or(desired_ids.len());
+        desired_ids.splice(insert_idx..insert_idx, workspace_ids.iter().cloned());
+        if self
+            .workspaces
+            .iter()
+            .map(|workspace| workspace.id.as_str())
+            .eq(desired_ids.iter().map(String::as_str))
+        {
+            return false;
+        }
+
+        let active_id = self.active.map(|idx| self.workspaces[idx].id.clone());
+        let selected_id = self
+            .workspaces
+            .get(self.selected)
+            .map(|workspace| workspace.id.clone());
+        let desired_positions = desired_ids
+            .iter()
+            .enumerate()
+            .map(|(index, id)| (id.clone(), index))
+            .collect::<std::collections::HashMap<_, _>>();
+
+        self.mark_session_dirty();
+        self.workspaces.sort_by_key(|workspace| {
+            desired_positions
+                .get(&workspace.id)
+                .copied()
+                .unwrap_or(usize::MAX)
+        });
+        self.active = active_id.and_then(|id| self.workspaces.iter().position(|ws| ws.id == id));
+        self.selected = selected_id
+            .and_then(|id| self.workspaces.iter().position(|ws| ws.id == id))
+            .unwrap_or(0);
+        self.ensure_workspace_visible(self.selected);
+        true
+    }
+
     pub fn scroll_tabs_left(&mut self) {
         self.tab_scroll_follow_active = false;
         self.tab_scroll = self.tab_scroll.saturating_sub(1);
@@ -4434,6 +4501,59 @@ mod tests {
     }
 
     #[test]
+    fn move_workspace_block_collects_non_contiguous_members() {
+        let mut state =
+            app_with_workspaces(&["child-one", "normal", "parent", "child-two", "tail"]);
+        let parent_id = state.workspaces[2].id.clone();
+        let child_one_id = state.workspaces[0].id.clone();
+        let child_two_id = state.workspaces[3].id.clone();
+        let tail_id = state.workspaces[4].id.clone();
+        state.active = Some(0);
+        state.selected = 4;
+
+        assert!(state.move_workspace_block(
+            &[parent_id, child_one_id.clone(), child_two_id],
+            Some(&tail_id),
+        ));
+
+        let names = state
+            .workspaces
+            .iter()
+            .map(|workspace| workspace.display_name())
+            .collect::<Vec<_>>();
+        assert_eq!(
+            names,
+            ["normal", "parent", "child-one", "child-two", "tail"]
+        );
+        assert_eq!(state.workspaces[state.active.unwrap()].id, child_one_id);
+        assert_eq!(state.workspaces[state.selected].id, tail_id);
+    }
+
+    #[test]
+    fn move_workspace_block_rejects_invalid_and_noop_orders() {
+        let mut state = app_with_workspaces(&["a", "b", "c"]);
+        let ids = state
+            .workspaces
+            .iter()
+            .map(|workspace| workspace.id.clone())
+            .collect::<Vec<_>>();
+
+        assert!(!state.move_workspace_block(&[], None));
+        assert!(!state.move_workspace_block(&[ids[0].clone(), ids[0].clone()], None));
+        assert!(!state.move_workspace_block(&["missing".into()], None));
+        assert!(!state.move_workspace_block(&[ids[0].clone()], Some(&ids[0])));
+        assert!(!state.move_workspace_block(&[ids[0].clone()], Some(&ids[1])));
+        assert_eq!(
+            state
+                .workspaces
+                .iter()
+                .map(|workspace| workspace.display_name())
+                .collect::<Vec<_>>(),
+            ["a", "b", "c"]
+        );
+    }
+
+    #[test]
     fn close_workspace_adjusts_indices() {
         let mut state = app_with_workspaces(&["a", "b", "c"]);
         state.selected = 1;