Allow buffer search in project search (#23819)

Closes #13437
Closes #19993

Release Notes:

- Allow searching within the results of a project search
- vim: Fix `/`/`?`, `n`/`N`, `gn`/`gN`,`*`/`#` in project search results

---------

Co-authored-by: Nico <nico.lehmann@gmail.com>

crates/editor/src/items.rs

@@ -38,8 +38,11 @@ use text::{BufferId, Selection};
 use theme::{Theme, ThemeSettings};
 use ui::{h_flex, prelude::*, IconDecorationKind, Label};
 use util::{paths::PathExt, ResultExt, TryFutureExt};
-use workspace::item::{BreadcrumbText, FollowEvent};
 use workspace::item::{Dedup, ItemSettings, SerializableItem, TabContentParams};
+use workspace::{
+    item::{BreadcrumbText, FollowEvent},
+    searchable::SearchOptions,
+};
 use workspace::{
     item::{FollowableItem, Item, ItemEvent, ProjectItem},
     searchable::{Direction, SearchEvent, SearchableItem, SearchableItemHandle},
@@ -1324,6 +1327,28 @@ impl SearchableItem for Editor {
         }
     }
 
+    fn supported_options(&self) -> SearchOptions {
+        if self.in_project_search {
+            SearchOptions {
+                case: true,
+                word: true,
+                regex: true,
+                replacement: false,
+                selection: false,
+                find_in_results: true,
+            }
+        } else {
+            SearchOptions {
+                case: true,
+                word: true,
+                regex: true,
+                replacement: true,
+                selection: true,
+                find_in_results: false,
+            }
+        }
+    }
+
     fn query_suggestion(&mut self, window: &mut Window, cx: &mut Context<Self>) -> String {
         let setting = EditorSettings::get_global(cx).seed_search_query_from_cursor;
         let snapshot = &self.snapshot(window, cx).buffer_snapshot;