Add a method for waiting until a worktree's current scan is complete

Start removing usages of finish_pending_tasks in tests

zed/src/workspace/workspace.rs

@@ -94,6 +94,19 @@ impl Workspace {
         &self.worktrees
     }
 
+    pub fn worktree_scans_complete(&self, ctx: &AppContext) -> impl Future<Output = ()> + 'static {
+        let futures = self
+            .worktrees
+            .iter()
+            .map(|worktree| worktree.read(ctx).scan_complete())
+            .collect::<Vec<_>>();
+        async move {
+            for future in futures {
+                future.await;
+            }
+        }
+    }
+
     pub fn contains_paths(&self, paths: &[PathBuf], app: &AppContext) -> bool {
         paths.iter().all(|path| self.contains_path(&path, app))
     }
@@ -235,7 +248,8 @@ mod tests {
             }));
 
             let workspace = app.add_model(|ctx| Workspace::new(vec![dir.path().into()], ctx));
-            app.finish_pending_tasks().await; // Open and populate worktree.
+            app.read(|ctx| workspace.read(ctx).worktree_scans_complete(ctx))
+                .await;
 
             // Get the first file entry.
             let tree = app.read(|ctx| workspace.read(ctx).worktrees.iter().next().unwrap().clone());

zed/src/workspace/workspace_view.rs

@@ -393,7 +393,8 @@ mod tests {
 
             let settings = settings::channel(&app.font_cache()).unwrap().1;
             let workspace = app.add_model(|ctx| Workspace::new(vec![dir.path().into()], ctx));
-            app.finish_pending_tasks().await; // Open and populate worktree.
+            app.read(|ctx| workspace.read(ctx).worktree_scans_complete(ctx))
+                .await;
             let entries = app.read(|ctx| workspace.file_entries(ctx));
 
             let (_, workspace_view) =