Fix a possible crash on find history build

CHANGELOG.md

@@ -8,6 +8,7 @@ Change Log
 ### Fixes
 
 - Fix an issue where the syntax highlighting indicator could display twice.
+- Improve general stability.
 
 
 

CotEditor/Sources/FindPanelFieldViewController.swift

@@ -257,9 +257,9 @@ final class FindPanelFieldViewController: NSViewController, NSTextViewDelegate {
     private func buildHistoryMenu(_ menu: NSMenu, defaultsKey key: DefaultKey<[String]>, action: Selector) {
         
         // clear current history items
-        for item in menu.items where (item.action == action || item.isSeparatorItem) {
-            menu.removeItem(item)
-        }
+        menu.items
+            .filter { $0.action == action || $0.isSeparatorItem }
+            .forEach { menu.removeItem($0) }
         
         guard let history = UserDefaults.standard[key], !history.isEmpty else { return }