Pass hold: true to Alacritty for tasks (#13898)

It seems `hold: false` causes alacritty to close the channel earlier,
without waiting for the output from the child command to go to Zed.

Fixes [#13683](https://github.com/zed-industries/zed/issues/13683)

Release Notes:

- Fixed loosing output of a spawned task
([#13683](https://github.com/zed-industries/zed/issues/13683)).

[Screencast from 2024-07-06
18-28-56.webm](https://github.com/zed-industries/zed/assets/39293/4ebef8b5-7c0d-46be-9341-4ac0d809458d)

crates/terminal/src/terminal.rs

@@ -340,7 +340,7 @@ impl TerminalBuilder {
             alacritty_terminal::tty::Options {
                 shell: alac_shell,
                 working_directory: working_directory.clone(),
-                hold: false,
+                hold: !matches!(shell.clone(), Shell::System),
                 env: env.into_iter().collect(),
             }
         };

crates/zed/src/zed.rs

@@ -958,8 +958,9 @@ fn open_settings_file(
 #[cfg(test)]
 mod tests {
     use super::*;
+    use anyhow::anyhow;
     use assets::Assets;
-    use collections::HashSet;
+    use collections::{HashMap, HashSet};
     use editor::{display_map::DisplayRow, scroll::Autoscroll, DisplayPoint, Editor};
     use gpui::{
         actions, Action, AnyWindowHandle, AppContext, AssetSource, BorrowAppContext, Entity,
@@ -970,6 +971,7 @@ mod tests {
     use serde_json::json;
     use settings::{handle_settings_file_changes, watch_config_file, SettingsStore};
     use std::path::{Path, PathBuf};
+    use task::{RevealStrategy, SpawnInTerminal};
     use theme::{ThemeRegistry, ThemeSettings};
     use workspace::{
         item::{Item, ItemHandle},
@@ -3167,11 +3169,96 @@ mod tests {
         cx.run_until_parked();
     }
 
-    fn init_test(cx: &mut TestAppContext) -> Arc<AppState> {
-        cx.update(|cx| {
-            env_logger::builder().is_test(true).try_init().ok();
+    #[gpui::test]
+    async fn test_spawn_terminal_task_real_fs(cx: &mut TestAppContext) {
+        let mut app_state = cx.update(|cx| AppState::test(cx));
+        let state = Arc::get_mut(&mut app_state).unwrap();
+        state.fs = Arc::new(fs::RealFs::default());
+        let app_state = init_test_with_state(cx, app_state);
 
-            let mut app_state = AppState::test(cx);
+        cx.executor().allow_parking();
+        let project_root = util::test::temp_tree(json!({
+            "sample.txt": ""
+        }));
+
+        let spawn_in_terminal = SpawnInTerminal {
+            command: "echo SAMPLE-OUTPUT".to_string(),
+            cwd: None,
+            env: HashMap::default(),
+            id: task::TaskId(String::from("sample-id")),
+            full_label: String::from("sample-full_label"),
+            label: String::from("sample-label"),
+            args: vec![],
+            command_label: String::from("sample-command_label"),
+            use_new_terminal: false,
+            allow_concurrent_runs: false,
+            reveal: RevealStrategy::Always,
+        };
+        let project = Project::test(app_state.fs.clone(), [project_root.path()], cx).await;
+        let window = cx.add_window(|cx| Workspace::test_new(project, cx));
+        cx.run_until_parked();
+        cx.update(|cx| {
+            window
+                .update(cx, |_workspace, cx| {
+                    cx.emit(workspace::Event::SpawnTask(spawn_in_terminal));
+                })
+                .unwrap();
+        });
+        cx.run_until_parked();
+
+        run_until(|| {
+            cx.update(|cx| {
+                window
+                    .read_with(cx, |workspace, cx| {
+                        let terminal = workspace
+                            .project()
+                            .read(cx)
+                            .local_terminal_handles()
+                            .first()
+                            .unwrap()
+                            .upgrade()
+                            .unwrap()
+                            .read(cx);
+                        terminal
+                            .last_n_non_empty_lines(99)
+                            .join("")
+                            .contains("SAMPLE-OUTPUT")
+                    })
+                    .unwrap()
+            })
+        })
+        .await;
+    }
+
+    async fn run_until(predicate: impl Fn() -> bool) {
+        let timer = async { smol::Timer::after(std::time::Duration::from_secs(3)).await };
+
+        use futures::FutureExt as _;
+        use smol::future::FutureExt as _;
+
+        async {
+            loop {
+                if predicate() {
+                    return Ok(());
+                }
+                smol::Timer::after(std::time::Duration::from_millis(10)).await;
+            }
+        }
+        .race(timer.map(|_| Err(anyhow!("condition timed out"))))
+        .await
+        .unwrap();
+    }
+
+    fn init_test(cx: &mut TestAppContext) -> Arc<AppState> {
+        init_test_with_state(cx, cx.update(|cx| AppState::test(cx)))
+    }
+
+    fn init_test_with_state(
+        cx: &mut TestAppContext,
+        mut app_state: Arc<AppState>,
+    ) -> Arc<AppState> {
+        cx.update(move |cx| {
+            env_logger::builder().is_test(true).try_init().ok();
 
             let state = Arc::get_mut(&mut app_state).unwrap();
             state.build_window_options = build_window_options;