feat(chat): make messagePreviewMaxLines configurable, with default 128

config.sample.json

@@ -12,6 +12,7 @@
   "audioRecordingSamplingRate": 44100,
   "renderHtml": true,
   "fontSizeFactor": 1,
+  "messagePreviewMaxLines": 128,
   "hideRedactedEvents": false,
   "hideUnknownEvents": true,
   "separateChatTypes": false,

lib/config/setting_keys.dart

@@ -9,6 +9,9 @@ import 'package:shared_preferences/shared_preferences.dart';
 
 enum AppSettings<T> {
   textMessageMaxLength<int>('textMessageMaxLength', 16384),
+
+  /// Max lines for unselected HTML/text bubbles; 0 = unlimited (no fade).
+  messagePreviewMaxLines<int>('chat.fluffy.message_preview_max_lines', 128),
   audioRecordingNumChannels<int>('audioRecordingNumChannels', 1),
   audioRecordingAutoGain<bool>('audioRecordingAutoGain', true),
   audioRecordingEchoCancel<bool>('audioRecordingEchoCancel', false),

lib/pages/chat/events/html_message.dart

@@ -1,4 +1,5 @@
 import 'package:collection/collection.dart';
+import 'package:fluffychat/config/setting_keys.dart';
 import 'package:fluffychat/utils/code_highlight_theme.dart';
 import 'package:fluffychat/utils/event_checkbox_extension.dart';
 import 'package:fluffychat/widgets/avatar.dart';
@@ -509,11 +510,15 @@ class HtmlMessage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final element = parser.parse(html).body ?? dom.Element.html('');
+    final configuredMaxLines = AppSettings.messagePreviewMaxLines.value;
+    final maxLines = !limitHeight || configuredMaxLines <= 0
+        ? null
+        : configuredMaxLines;
     return Text.rich(
       _renderHtml(element, context),
       style: TextStyle(fontSize: fontSize, color: textColor),
-      maxLines: limitHeight ? 64 : null,
+      maxLines: maxLines,
-      overflow: TextOverflow.fade,
+      overflow: maxLines == null ? TextOverflow.visible : TextOverflow.fade,
       selectionColor: textColor.withAlpha(128),
     );
   }