fix(keyboard): shortcuts, keep an empty binding list on re-enable

setEnabled seeded the defaults whenever the binding list was empty, so a
user who cleared every binding got all defaults back after disable and
enable. Seed only when the config has never held a bindings list.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ra4my61t8q1FN5n59wB16D

flutter/lib/common/widgets/keyboard_shortcuts/shortcut_utils.dart

@@ -35,6 +35,12 @@ Set<String> shortcutModSetFrom(dynamic rawMods) {
   return rawMods.whereType<String>().toSet();
 }
 
+/// Whether enabling shortcuts should seed the default bindings. Only a config
+/// that has never held a bindings list is seeded; an empty list means the
+/// user cleared every binding and must stay empty.
+bool shouldSeedDefaultShortcutBindings(Map<String, dynamic> config) =>
+    !config.containsKey('bindings');
+
 bool isSwitchTabShortcutAction(String? actionId) {
   return actionId == kShortcutActionSwitchTabNext ||
       actionId == kShortcutActionSwitchTabPrev;

flutter/lib/models/shortcut_model.dart

@@ -135,7 +135,7 @@ class ShortcutModel {
 
   /// Flip the master `enabled` flag and persist. On the first enable we seed
   /// the default bindings so common combos work out of the box; otherwise we
-  /// preserve whatever the user already has. Refreshes the matcher cache so
+  /// preserve whatever the user already has, an empty list included. Refreshes the matcher cache so
   /// the change takes effect immediately (Rust on native, JS via the bridge
   /// on Web).
   static Future<void> setEnabled(bool v) async {
@@ -149,14 +149,13 @@ class ShortcutModel {
       }
     }
     json['enabled'] = v;
-    final list = shortcutBindingMapsFrom(json['bindings']);
-    if (v && list.isEmpty) {
+    if (v && shouldSeedDefaultShortcutBindings(json)) {
       json['bindings'] = filterDefaultBindingsForPlatform(
         jsonDecode(bind.mainGetDefaultKeyboardShortcuts()) as List,
         currentPlatformCapabilities(),
       );
-    } else {
-      json['bindings'] = list;
+    } else if (json.containsKey('bindings')) {
+      json['bindings'] = shortcutBindingMapsFrom(json['bindings']);
     }
     await bind.mainSetLocalOption(
         key: kShortcutLocalConfigKey, value: jsonEncode(json));

flutter/test/keyboard_shortcuts_test.dart

@@ -397,6 +397,19 @@ void main() {
     expect(physicalKeyName(PhysicalKeyboardKey.numpad1), isNull);
   });
 
+  test('enable seeds defaults only for a config without bindings', () {
+    expect(shouldSeedDefaultShortcutBindings(<String, dynamic>{}), isTrue);
+    expect(
+        shouldSeedDefaultShortcutBindings(
+            <String, dynamic>{'enabled': false, 'pass_through': true}),
+        isTrue);
+    // The user cleared every binding: re-enabling must not bring defaults back.
+    expect(
+        shouldSeedDefaultShortcutBindings(
+            <String, dynamic>{'enabled': false, 'bindings': <dynamic>[]}),
+        isFalse);
+  });
+
   test('non-US layouts record and match the physical key', () {
     // AZERTY: the key labelled "A" sits where US QWERTY has Q. The native
     // matcher only sees the physical position (USB HID usage), so the