Fix vim-related panic (#2986)

Release Notes:

- fix panic that happens during collaboration (preview-only)

crates/vim/src/editor_events.rs

@@ -34,11 +34,11 @@ fn focused(EditorFocused(editor): &EditorFocused, cx: &mut AppContext) {
 fn blurred(EditorBlurred(editor): &EditorBlurred, cx: &mut AppContext) {
     editor.window().update(cx, |cx| {
         Vim::update(cx, |vim, cx| {
-            vim.clear_operator(cx);
             vim.workspace_state.recording = false;
             vim.workspace_state.recorded_actions.clear();
             if let Some(previous_editor) = vim.active_editor.clone() {
                 if previous_editor == editor.clone() {
+                    vim.clear_operator(cx);
                     vim.active_editor = None;
                 }
             }
@@ -60,3 +60,31 @@ fn released(EditorReleased(editor): &EditorReleased, cx: &mut AppContext) {
         });
     });
 }
+
+#[cfg(test)]
+mod test {
+    use crate::{test::VimTestContext, Vim};
+    use editor::Editor;
+    use gpui::View;
+    use language::Buffer;
+
+    // regression test for blur called with a different active editor
+    #[gpui::test]
+    async fn test_blur_focus(cx: &mut gpui::TestAppContext) {
+        let mut cx = VimTestContext::new(cx, true).await;
+
+        let buffer = cx.add_model(|_| Buffer::new(0, 0, "a = 1\nb = 2\n"));
+        let window2 = cx.add_window(|cx| Editor::for_buffer(buffer, None, cx));
+        let editor2 = cx.read(|cx| window2.root(cx)).unwrap();
+
+        cx.update(|cx| {
+            let vim = Vim::read(cx);
+            assert_eq!(vim.active_editor.unwrap().id(), editor2.id())
+        });
+
+        // no panic when blurring an editor in a different window.
+        cx.update_editor(|editor1, cx| {
+            editor1.focus_out(cx.handle().into_any(), cx);
+        });
+    }
+}