msglist: Hide content of muted messages, with a "Reveal message" button

Figma design:
  https://www.figma.com/design/1JTNtYo9memgW7vV6d0ygq/Zulip-Mobile?node-id=6089-28385&t=28DdYiTs6fXWR9ua-0

Co-authored-by: Sayed Mahmood Sayedi <smahmood.sayedi@gmail.com>

Author: chrisbobbe

assets/l10n/app_en.arb

@@ -1047,7 +1047,7 @@
   "@noEarlierMessages": {
     "description": "Text to show at the start of a message list if there are no earlier messages."
   },
-  "revealButtonLabel": "Reveal message for muted sender",
+  "revealButtonLabel": "Reveal message",
   "@revealButtonLabel": {
     "description": "Label for the button revealing hidden message from a muted sender in message list."
   },

assets/l10n/app_pl.arb

@@ -1085,10 +1085,6 @@
   "@mutedSender": {
     "description": "Name for a muted user to display in message list."
   },
-  "revealButtonLabel": "Odsłoń wiadomość od wyciszonego użytkownika",
-  "@revealButtonLabel": {
-    "description": "Label for the button revealing hidden message from a muted sender in message list."
-  },
   "mutedUser": "Wyciszony użytkownik",
   "@mutedUser": {
     "description": "Name for a muted user to display all over the app."

assets/l10n/app_ru.arb

@@ -1077,10 +1077,6 @@
   "@mutedSender": {
     "description": "Name for a muted user to display in message list."
   },
-  "revealButtonLabel": "Показать сообщение отключенного отправителя",
-  "@revealButtonLabel": {
-    "description": "Label for the button revealing hidden message from a muted sender in message list."
-  },
   "mutedUser": "Отключенный пользователь",
   "@mutedUser": {
     "description": "Name for a muted user to display all over the app."

lib/generated/l10n/zulip_localizations.dart

@@ -1566,7 +1566,7 @@ abstract class ZulipLocalizations {
   /// Label for the button revealing hidden message from a muted sender in message list.
   ///
   /// In en, this message translates to:
-  /// **'Reveal message for muted sender'**
+  /// **'Reveal message'**
   String get revealButtonLabel;
 
   /// Text to display in place of a muted user's name.

lib/generated/l10n/zulip_localizations_ar.dart

@@ -855,7 +855,7 @@ class ZulipLocalizationsAr extends ZulipLocalizations {
   String get noEarlierMessages => 'No earlier messages';
 
   @override
-  String get revealButtonLabel => 'Reveal message for muted sender';
+  String get revealButtonLabel => 'Reveal message';
 
   @override
   String get mutedUser => 'Muted user';

lib/generated/l10n/zulip_localizations_en.dart

@@ -855,7 +855,7 @@ class ZulipLocalizationsEn extends ZulipLocalizations {
   String get noEarlierMessages => 'No earlier messages';
 
   @override
-  String get revealButtonLabel => 'Reveal message for muted sender';
+  String get revealButtonLabel => 'Reveal message';
 
   @override
   String get mutedUser => 'Muted user';

lib/generated/l10n/zulip_localizations_ja.dart

@@ -855,7 +855,7 @@ class ZulipLocalizationsJa extends ZulipLocalizations {
   String get noEarlierMessages => 'No earlier messages';
 
   @override
-  String get revealButtonLabel => 'Reveal message for muted sender';
+  String get revealButtonLabel => 'Reveal message';
 
   @override
   String get mutedUser => 'Muted user';

lib/generated/l10n/zulip_localizations_nb.dart

@@ -855,7 +855,7 @@ class ZulipLocalizationsNb extends ZulipLocalizations {
   String get noEarlierMessages => 'No earlier messages';
 
   @override
-  String get revealButtonLabel => 'Reveal message for muted sender';
+  String get revealButtonLabel => 'Reveal message';
 
   @override
   String get mutedUser => 'Muted user';

lib/generated/l10n/zulip_localizations_pl.dart

@@ -868,7 +868,7 @@ class ZulipLocalizationsPl extends ZulipLocalizations {
   String get noEarlierMessages => 'Brak historii';
 
   @override
-  String get revealButtonLabel => 'Odsłoń wiadomość od wyciszonego użytkownika';
+  String get revealButtonLabel => 'Reveal message';
 
   @override
   String get mutedUser => 'Wyciszony użytkownik';

lib/generated/l10n/zulip_localizations_ru.dart

@@ -872,7 +872,7 @@ class ZulipLocalizationsRu extends ZulipLocalizations {
   String get noEarlierMessages => 'Предшествующих сообщений нет';
 
   @override
-  String get revealButtonLabel => 'Показать сообщение отключенного отправителя';
+  String get revealButtonLabel => 'Reveal message';
 
   @override
   String get mutedUser => 'Отключенный пользователь';

lib/generated/l10n/zulip_localizations_sk.dart

@@ -857,7 +857,7 @@ class ZulipLocalizationsSk extends ZulipLocalizations {
   String get noEarlierMessages => 'No earlier messages';
 
   @override
-  String get revealButtonLabel => 'Reveal message for muted sender';
+  String get revealButtonLabel => 'Reveal message';
 
   @override
   String get mutedUser => 'Muted user';

lib/generated/l10n/zulip_localizations_zh.dart

@@ -855,7 +855,7 @@ class ZulipLocalizationsZh extends ZulipLocalizations {
   String get noEarlierMessages => 'No earlier messages';
 
   @override
-  String get revealButtonLabel => 'Reveal message for muted sender';
+  String get revealButtonLabel => 'Reveal message';
 
   @override
   String get mutedUser => 'Muted user';

lib/widgets/action_sheet.dart

@@ -589,6 +589,8 @@ void showMessageActionSheet({required BuildContext context, required Message mes
   final markAsUnreadSupported = store.zulipFeatureLevel >= 155; // TODO(server-6)
   final showMarkAsUnreadButton = markAsUnreadSupported && isMessageRead;
 
+  final isSenderMuted = store.isUserMuted(message.senderId);
+
   final optionButtons = [
     if (popularEmojiLoaded)
       ReactionButtons(message: message, pageContext: pageContext),
@@ -597,6 +599,9 @@ void showMessageActionSheet({required BuildContext context, required Message mes
       QuoteAndReplyButton(message: message, pageContext: pageContext),
     if (showMarkAsUnreadButton)
       MarkAsUnreadButton(message: message, pageContext: pageContext),
+    if (isSenderMuted)
+      // The message must have been revealed in order to open this action sheet.
+      UnrevealMutedMessageButton(message: message, pageContext: pageContext),
     CopyMessageTextButton(message: message, pageContext: pageContext),
     CopyMessageLinkButton(message: message, pageContext: pageContext),
     ShareButton(message: message, pageContext: pageContext),
@@ -904,6 +909,30 @@ class MarkAsUnreadButton extends MessageActionSheetMenuItemButton {
   }
 }
 
+class UnrevealMutedMessageButton extends MessageActionSheetMenuItemButton {
+  UnrevealMutedMessageButton({
+    super.key,
+    required super.message,
+    required super.pageContext,
+  });
+
+  @override
+  IconData get icon => ZulipIcons.eye_off;
+
+  @override
+  String label(ZulipLocalizations zulipLocalizations) {
+    return zulipLocalizations.actionSheetOptionHideMutedMessage;
+  }
+
+  @override
+  void onPressed() {
+    // The message should have been revealed in order to reach this action sheet.
+    assert(MessageListPage.revealedMutedMessagesOf(pageContext)
+      .isMutedMessageRevealed(message.id));
+    findMessageListPage().unrevealMutedMessage(message.id);
+  }
+}
+
 class CopyMessageTextButton extends MessageActionSheetMenuItemButton {
   CopyMessageTextButton({super.key, required super.message, required super.pageContext});