Be more lenient when looking up gitignored files in file finder (#31457)

The lookup was disabled due to concerns of being forced to traverse many
gitignored file entries. Since Zed does not index these eagerly, but
only contents of the directories that are parent to the gitignored file
entries, it might be not that bad — let's see how much improvement it
provides.

Closes https://github.com/zed-industries/zed/issues/31016

Release Notes:

- Improved file finder to include indexed gitignored files in its search
results

crates/file_finder/src/file_finder.rs

@@ -779,9 +779,7 @@ impl FileFinderDelegate {
                 let worktree = worktree.read(cx);
                 PathMatchCandidateSet {
                     snapshot: worktree.snapshot(),
-                    include_ignored: worktree
-                        .root_entry()
-                        .map_or(false, |entry| entry.is_ignored),
+                    include_ignored: true,
                     include_root_name,
                     candidates: project::Candidates::Files,
                 }

crates/file_finder/src/file_finder_tests.rs

@@ -7,7 +7,7 @@ use menu::{Confirm, SelectNext, SelectPrevious};
 use project::{FS_WATCH_LATENCY, RemoveOptions};
 use serde_json::json;
 use util::path;
-use workspace::{AppState, OpenOptions, ToggleFileFinder, Workspace};
+use workspace::{AppState, CloseActiveItem, OpenOptions, ToggleFileFinder, Workspace};
 
 #[ctor::ctor]
 fn init_logger() {
@@ -615,9 +615,13 @@ async fn test_ignored_root(cx: &mut TestAppContext) {
                     "hiccup": "",
                 },
                 "tracked-root": {
-                    ".gitignore": "height",
+                    ".gitignore": "height*",
                     "happiness": "",
                     "height": "",
+                    "heights": {
+                        "height_1": "",
+                        "height_2": "",
+                    },
                     "hi": "",
                     "hiccup": "",
                 },
@@ -628,14 +632,13 @@ async fn test_ignored_root(cx: &mut TestAppContext) {
     let project = Project::test(
         app_state.fs.clone(),
         [
-            "/ancestor/tracked-root".as_ref(),
-            "/ancestor/ignored-root".as_ref(),
+            Path::new(path!("/ancestor/tracked-root")),
+            Path::new(path!("/ancestor/ignored-root")),
         ],
         cx,
     )
     .await;
-
-    let (picker, _, cx) = build_find_picker(project, cx);
+    let (picker, workspace, cx) = build_find_picker(project, cx);
 
     picker
         .update_in(cx, |picker, window, cx| {
@@ -644,7 +647,75 @@ async fn test_ignored_root(cx: &mut TestAppContext) {
                 .spawn_search(test_path_position("hi"), window, cx)
         })
         .await;
-    picker.update(cx, |picker, _| assert_eq!(picker.delegate.matches.len(), 7));
+    picker.update(cx, |picker, _| {
+        let matches = collect_search_matches(picker);
+        assert_eq!(matches.history.len(), 0);
+        assert_eq!(
+            matches.search,
+            vec![
+                PathBuf::from("ignored-root/hi"),
+                PathBuf::from("tracked-root/hi"),
+                PathBuf::from("ignored-root/hiccup"),
+                PathBuf::from("tracked-root/hiccup"),
+                PathBuf::from("ignored-root/height"),
+                PathBuf::from("tracked-root/height"),
+                PathBuf::from("ignored-root/happiness"),
+                PathBuf::from("tracked-root/happiness"),
+            ],
+            "All ignored files that were indexed are found"
+        );
+    });
+
+    workspace
+        .update_in(cx, |workspace, window, cx| {
+            workspace.open_abs_path(
+                PathBuf::from(path!("/ancestor/tracked-root/heights/height_1")),
+                OpenOptions {
+                    visible: Some(OpenVisible::None),
+                    ..OpenOptions::default()
+                },
+                window,
+                cx,
+            )
+        })
+        .await
+        .unwrap();
+    workspace
+        .update_in(cx, |workspace, window, cx| {
+            workspace.active_pane().update(cx, |pane, cx| {
+                pane.close_active_item(&CloseActiveItem::default(), window, cx)
+                    .unwrap()
+            })
+        })
+        .await
+        .unwrap();
+    picker
+        .update_in(cx, |picker, window, cx| {
+            picker
+                .delegate
+                .spawn_search(test_path_position("hi"), window, cx)
+        })
+        .await;
+    picker.update(cx, |picker, _| {
+        let matches = collect_search_matches(picker);
+        assert_eq!(matches.history.len(), 0);
+        assert_eq!(
+            matches.search,
+            vec![
+                PathBuf::from("ignored-root/hi"),
+                PathBuf::from("tracked-root/hi"),
+                PathBuf::from("ignored-root/hiccup"),
+                PathBuf::from("tracked-root/hiccup"),
+                PathBuf::from("ignored-root/height"),
+                PathBuf::from("tracked-root/height"),
+                PathBuf::from("tracked-root/heights/height_1"),
+                PathBuf::from("tracked-root/heights/height_2"),
+                PathBuf::from("ignored-root/happiness"),
+                PathBuf::from("tracked-root/happiness"),
+            ],
+            "All ignored files that were indexed are found"
+        );
+    });
 }
 
 #[gpui::test]