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/terminal_view/src/terminal_view.rs

@@ -1479,13 +1479,14 @@ impl SerializableItem for TerminalView {
 impl SearchableItem for TerminalView {
     type Match = RangeInclusive<Point>;
 
-    fn supported_options() -> SearchOptions {
+    fn supported_options(&self) -> SearchOptions {
         SearchOptions {
             case: false,
             word: false,
             regex: true,
             replacement: false,
             selection: false,
+            find_in_results: false,
         }
     }