Allow opening non-extant files (#9256)

Fixes #7400



Release Notes:

- Improved the `zed` command to not create files until you save them in
the editor ([#7400](https://github.com/zed-industries/zed/issues/7400)).

crates/zed/src/zed.rs

@@ -875,6 +875,41 @@ mod tests {
         WorkspaceHandle,
     };
 
+    #[gpui::test]
+    async fn test_open_non_existing_file(cx: &mut TestAppContext) {
+        let app_state = init_test(cx);
+        app_state
+            .fs
+            .as_fake()
+            .insert_tree(
+                "/root",
+                json!({
+                    "a": {
+                    },
+                }),
+            )
+            .await;
+
+        cx.update(|cx| {
+            open_paths(
+                &[PathBuf::from("/root/a/new")],
+                app_state.clone(),
+                workspace::OpenOptions::default(),
+                cx,
+            )
+        })
+        .await
+        .unwrap();
+        assert_eq!(cx.read(|cx| cx.windows().len()), 1);
+
+        let workspace = cx.windows()[0].downcast::<Workspace>().unwrap();
+        workspace
+            .update(cx, |workspace, cx| {
+                assert!(workspace.active_item_as::<Editor>(cx).is_some())
+            })
+            .unwrap();
+    }
+
     #[gpui::test]
     async fn test_open_paths_action(cx: &mut TestAppContext) {
         let app_state = init_test(cx);
@@ -1657,6 +1692,9 @@ mod tests {
                     },
                     "excluded_dir": {
                         "file": "excluded file contents",
+                        "ignored_subdir": {
+                            "file": "ignored subfile contents",
+                        },
                     },
                 }),
             )
@@ -2305,7 +2343,7 @@ mod tests {
             (file3.clone(), DisplayPoint::new(0, 0), 0.)
         );
 
-        // Go back to an item that has been closed and removed from disk, ensuring it gets skipped.
+        // Go back to an item that has been closed and removed from disk
         workspace
             .update(cx, |_, cx| {
                 pane.update(cx, |pane, cx| {
@@ -2331,7 +2369,7 @@ mod tests {
             .unwrap();
         assert_eq!(
             active_location(&workspace, cx),
-            (file1.clone(), DisplayPoint::new(10, 0), 0.)
+            (file2.clone(), DisplayPoint::new(0, 0), 0.)
         );
         workspace
             .update(cx, |w, cx| w.go_forward(w.active_pane().downgrade(), cx))