Make buffer search aware of search direction (#24974)

This solves a couple of issues with Vim search by making the search
buffer and `SearchableItem` aware of the direction of the search. If
`SearchOptions::BACKWARDS` is set, all operations will be reversed. By
making `SearchableItem` aware of the direction, the correct active match
can be selected when searching backward.

Fixes #22506. This PR does not fix the last problem in that issue, but
that one is also tracked in #8049.

Release Notes:

- Fixes incorrect behavior of backward search in Vim mode

crates/language_tools/src/lsp_log.rs

@@ -16,7 +16,7 @@ use std::{borrow::Cow, sync::Arc};
 use ui::{prelude::*, Button, Checkbox, ContextMenu, Label, PopoverMenu, ToggleState};
 use workspace::{
     item::{Item, ItemHandle},
-    searchable::{SearchEvent, SearchableItem, SearchableItemHandle},
+    searchable::{Direction, SearchEvent, SearchableItem, SearchableItemHandle},
     SplitDirection, ToolbarItemEvent, ToolbarItemLocation, ToolbarItemView, Workspace, WorkspaceId,
 };
 
@@ -1170,12 +1170,14 @@ impl SearchableItem for LspLogView {
     }
     fn active_match_index(
         &mut self,
+        direction: Direction,
         matches: &[Self::Match],
         window: &mut Window,
         cx: &mut Context<Self>,
     ) -> Option<usize> {
-        self.editor
-            .update(cx, |e, cx| e.active_match_index(matches, window, cx))
+        self.editor.update(cx, |e, cx| {
+            e.active_match_index(direction, matches, window, cx)
+        })
     }
 }