search: debounce when searching

so we don't spawn tons of searching tasks for no reason

damus/Views/Search/PullDownSearch.swift

@@ -13,20 +13,16 @@ struct PullDownSearchView: View {
     @State private var search_text = ""
     @State private var results: [NostrEvent] = []
     @State private var is_active: Bool = false
+    let debouncer: Debouncer = Debouncer(interval: 0.25)
     let state: DamusState
     let on_cancel: () -> Void
     
-    var body: some View {
+    func do_search(query: String) {
-        VStack(alignment: .leading) {
+        let note_keys = state.ndb.text_search(query: query, limit: 16)
-            HStack {
-                TextField("Search", text: $search_text)
-                    .textFieldStyle(RoundedBorderTextFieldStyle())
-                    .onChange(of: search_text) { newValue in
-                        Task.detached {
-                            let note_keys = state.ndb.text_search(query: newValue, limit: 16)
         var res = [NostrEvent]()
         // TODO: fix duplicate results from search
         var keyset = Set<NoteKey>()
+        
         do {
             let txn = NdbTxn(ndb: state.ndb)
             for note_key in note_keys {
@@ -48,6 +44,18 @@ struct PullDownSearchView: View {
             results = res_
         }
     }
+
+    var body: some View {
+        VStack(alignment: .leading) {
+            HStack {
+                TextField("Search", text: $search_text)
+                    .textFieldStyle(RoundedBorderTextFieldStyle())
+                    .onChange(of: search_text) { query in
+                        debouncer.debounce {
+                            Task.detached {
+                                do_search(query: query)
+                            }
+                        }
                     }
                     .onTapGesture {
                         is_active = true