Maintain search results as query and active editor changes

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/gpui/src/app.rs

@@ -3246,6 +3246,7 @@ impl Drop for AnyModelHandle {
         self.ref_counts.lock().dec_model(self.model_id);
     }
 }
+
 pub struct WeakViewHandle<T> {
     window_id: usize,
     view_id: usize,
@@ -3288,6 +3289,21 @@ impl<T> Clone for WeakViewHandle<T> {
     }
 }
 
+impl<T> PartialEq for WeakViewHandle<T> {
+    fn eq(&self, other: &Self) -> bool {
+        self.window_id == other.window_id && self.view_id == other.view_id
+    }
+}
+
+impl<T> Eq for WeakViewHandle<T> {}
+
+impl<T> Hash for WeakViewHandle<T> {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.window_id.hash(state);
+        self.view_id.hash(state);
+    }
+}
+
 #[derive(Clone, Copy, PartialEq, Eq, Hash)]
 pub struct ElementStateId(usize, usize);