Add some General topic phrases.

Telegram/Resources/langs/lang.strings

@@ -1557,9 +1557,13 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_action_topic_created_inside" = "Topic created";
 "lng_action_topic_closed_inside" = "Topic closed";
 "lng_action_topic_reopened_inside" = "Topic reopened";
+"lng_action_topic_hidden_inside" = "Topic hidden";
+"lng_action_topic_unhidden_inside" = "Topic unhidden";
 "lng_action_topic_created" = "«{topic}» was created";
 "lng_action_topic_closed" = "«{topic}» was closed";
 "lng_action_topic_reopened" = "«{topic}» was reopened";
+"lng_action_topic_hidden" = "«{topic}» was hidden";
+"lng_action_topic_unhidden" = "«{topic}» was unhidden";
 "lng_action_topic_placeholder" = "topic";
 "lng_action_topic_renamed" = "{from} renamed the {link} to «{title}»";
 "lng_action_topic_icon_changed" = "{from} changed the {link} icon to {emoji}";
@@ -3162,6 +3166,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_admin_log_topics_changed" = "{from} changed topic {topic} to {new_topic}";
 "lng_admin_log_topics_closed" = "{from} closed topic {topic}";
 "lng_admin_log_topics_reopened" = "{from} reopened topic {topic}";
+"lng_admin_log_topics_hidden" = "{from} hid topic {topic}";
+"lng_admin_log_topics_unhidden" = "{from} unhid topic {topic}";
 "lng_admin_log_topics_deleted" = "{from} deleted topic {topic}";
 "lng_admin_log_topics_pinned" = "{from} pinned topic {topic}";
 "lng_admin_log_topics_unpinned" = "{from} unpinned topic {topic}";

Telegram/SourceFiles/history/admin_log/history_admin_log_item.cpp

@@ -630,6 +630,14 @@ TextWithEntities GenerateDefaultBannedRightsChangeText(
 	});
 }
 
+[[nodiscard]] bool IsTopicHidden(const MTPForumTopic &topic) {
+	return topic.match([](const MTPDforumTopic &data) {
+		return data.is_hidden();
+	}, [](const MTPDforumTopicDeleted &) {
+		return false;
+	});
+}
+
 [[nodiscard]] TextWithEntities GenerateTopicLink(
 		not_null<ChannelData*> channel,
 		const MTPForumTopic &topic) {
@@ -1713,6 +1721,19 @@ void GenerateItems(
 					nowLink,
 					Ui::Text::WithEntities));
 		}
+		const auto wasHidden = IsTopicHidden(data.vprev_topic());
+		const auto nowHidden = IsTopicHidden(data.vnew_topic());
+		if (nowHidden != wasHidden) {
+			addSimpleServiceMessage((nowHidden
+				? tr::lng_admin_log_topics_hidden
+				: tr::lng_admin_log_topics_unhidden)(
+					tr::now,
+					lt_from,
+					fromLinkText,
+					lt_topic,
+					nowLink,
+					Ui::Text::WithEntities));
+		}
 	};
 
 	const auto createDeleteTopic = [&](const LogDeleteTopic &data) {

Telegram/SourceFiles/history/history_service.cpp

@@ -674,6 +674,10 @@ void HistoryService::setMessageByAction(const MTPmessageAction &action) {
 			result.text = { mtpIsTrue(*closed)
 				? tr::lng_action_topic_closed_inside(tr::now)
 				: tr::lng_action_topic_reopened_inside(tr::now) };
+		} else if (const auto hidden = action.vhidden()) {
+			result.text = { mtpIsTrue(*hidden)
+				? tr::lng_action_topic_hidden_inside(tr::now)
+				: tr::lng_action_topic_unhidden_inside(tr::now) };
 		} else if (!action.vtitle()) {
 			if (const auto icon = action.vicon_emoji_id()) {
 				if (const auto iconId = icon->v) {

Telegram/SourceFiles/history/view/history_view_element.cpp

@@ -676,16 +676,12 @@ auto Element::contextDependentServiceText() -> TextWithLinks {
 	if (!info) {
 		return {};
 	}
-	const auto created = !info->closed
-		&& !info->reopened
-		&& !info->renamed
-		&& !info->reiconed;
 	if (_delegate->elementContext() == Context::Replies) {
-		if (created) {
+		if (info->created()) {
 			return { { tr::lng_action_topic_created_inside(tr::now) } };
 		}
 		return {};
-	} else if (created) {
+	} else if (info->created()) {
 		return{};
 	}
 	const auto peerId = item->history()->peer->id;
@@ -750,6 +746,22 @@ auto Element::contextDependentServiceText() -> TextWithLinks {
 				wrapParentTopic(),
 				Ui::Text::WithEntities),
 		};
+	} else if (info->hidden) {
+		return {
+			tr::lng_action_topic_hidden(
+				tr::now,
+				lt_topic,
+				wrapParentTopic(),
+				Ui::Text::WithEntities),
+		};
+	} else if (info->unhidden) {
+		return {
+			tr::lng_action_topic_unhidden(
+				tr::now,
+				lt_topic,
+				wrapParentTopic(),
+				Ui::Text::WithEntities),
+		};
 	} else if (info->renamed) {
 		return {
 			tr::lng_action_topic_renamed(