hide server ACL events from timeline by default, introduce setting to show them

lib/controllers/settings_sections.dart

@@ -230,6 +230,21 @@ class SettingsSectionsController
                     .onError(showError),
               ),
             ),
+            .new(
+              title: "Hide Server ACL Events",
+              description: "Hides server ACL (server ban list) changes from appearing in conversations.",
+              icon: Icons.dns,
+              builder: (title, description, icon) => SwitchListTile(
+                title: Text(title),
+                subtitle: Text(description),
+                secondary: Icon(icon),
+                value: settings.hideServerAclEvents,
+                onChanged: (value) => ref
+                    .read(SettingsController.provider.notifier)
+                    .set(settings.copyWith(hideServerAclEvents: value))
+                    .onError(showError),
+              ),
+            ),
           ]),
         ),
         .new(

lib/models/settings.dart

@@ -17,6 +17,7 @@ class const Settings({
   final bool showMinimizeButton = false,
   final bool swipeToReply = false,
   final bool hideMembershipEvents = false,
+  final bool hideServerAclEvents = true,
   final RoomOrder roomOrder = .unreadFirst,
   final NameColor nameColor = .powerLevel,
   final ShowAndSend typingIndicators = .showAndSend,

lib/widgets/renderers/event.dart

@@ -90,12 +90,13 @@ class const EventRenderer(
 
     if (event == null) return SizedBox.shrink();
 
-    final hideMembershipEvents = (ref
+    final (hideMembershipEvents, hideServerAclEvents) = ref
         .watch(SettingsController.provider)
         .maybeWhen(
-          orElse: () => false,
-          data: (settings) => settings.hideMembershipEvents,
-        ));
+          orElse: () => (false, true),
+          data: (settings) =>
+              (settings.hideMembershipEvents, settings.hideServerAclEvents),
+        );
 
     // Knocks and their outcomes stay visible, as moderators need to act on them
     if (hideMembershipEvents &&
@@ -106,6 +107,10 @@ class const EventRenderer(
       return SizedBox.shrink();
     }
 
+    if (hideServerAclEvents && event.content is ServerACLContent) {
+      return SizedBox.shrink();
+    }
+
     final isGrouped =
         (previousEvent?.isShownAsMessage ?? false) &&
         event.sender == previousEvent?.sender &&