Ensure focus_in and focus_out fire on window activation (#3993)

Also:
- Rename cx.on_blur to cx.on_focus_lost
- Fix a bug where notify calls in focus handlers were ignored
- Fix a bug where vim would get stuck in the wrong mode when switching
  windows

Release Notes:

- (preview only) vim: fix switching between multiple windows

crates/collab/src/tests/following_tests.rs

@@ -76,6 +76,10 @@ async fn test_basic_following(
     let (workspace_a, cx_a) = client_a.build_workspace(&project_a, cx_a);
     let (workspace_b, cx_b) = client_b.build_workspace(&project_b, cx_b);
 
+    cx_b.update(|cx| {
+        assert!(cx.is_window_active());
+    });
+
     // Client A opens some editors.
     let pane_a = workspace_a.update(cx_a, |workspace, _| workspace.active_pane().clone());
     let editor_a1 = workspace_a

crates/collab/src/tests/test_server.rs

@@ -664,7 +664,10 @@ impl TestClient {
         project: &Model<Project>,
         cx: &'a mut TestAppContext,
     ) -> (View<Workspace>, &'a mut VisualTestContext) {
-        cx.add_window_view(|cx| Workspace::new(0, project.clone(), self.app_state.clone(), cx))
+        cx.add_window_view(|cx| {
+            cx.activate_window();
+            Workspace::new(0, project.clone(), self.app_state.clone(), cx)
+        })
     }
 
     pub fn active_workspace<'a>(