Show small unread mark for non-opened topics.

Telegram/SourceFiles/data/data_forum_topic.cpp

@@ -750,6 +750,7 @@ Dialogs::BadgesState ForumTopic::chatListBadgesState() const {
 	if (!result.unread && _replies->inboxReadTillId() < 2) {
 		result.unread = channel()->amIn()
 			&& (_lastKnownServerMessageId > history()->inboxReadTillId());
+		result.unreadMuted = muted();
 	}
 	return result;
 }

Telegram/SourceFiles/dialogs/dialogs.style

@@ -20,6 +20,7 @@ DialogRow {
 	topicsSkip: pixels;
 	topicsSkipBig: pixels;
 	topicsHeight: pixels;
+	unreadMarkDiameter: pixels;
 }
 
 ForumTopicIcon {
@@ -474,6 +475,7 @@ forumTopicRow: DialogRow(defaultDialogRow) {
 	nameTop: 7px;
 	textLeft: 68px;
 	textTop: 29px;
+	unreadMarkDiameter: 8px;
 }
 forumTopicIconPosition: point(2px, 0px);
 editTopicTitleMargin: margins(70px, 2px, 22px, 18px);

Telegram/SourceFiles/dialogs/ui/dialogs_layout.cpp

@@ -112,7 +112,32 @@ int PaintBadges(
 		bool displayPinnedIcon = false,
 		int pinnedIconTop = 0) {
 	auto initial = right;
-	if (badgesState.unread) {
+	if (badgesState.unread
+		&& !badgesState.unreadCounter
+		&& context.st->unreadMarkDiameter > 0) {
+		const auto d = context.st->unreadMarkDiameter;
+		UnreadBadgeStyle st;
+		PainterHighQualityEnabler hq(p);
+		const auto rect = QRect(
+			right - st.size + (st.size - d) / 2,
+			top + (st.size - d) / 2,
+			d,
+			d);
+		p.setPen(Qt::NoPen);
+		p.setBrush(badgesState.unreadMuted
+			? (context.active
+				? st::dialogsUnreadBgMutedActive
+				: context.selected
+				? st::dialogsUnreadBgMutedOver
+				: st::dialogsUnreadBgMuted)
+			: (context.active
+				? st::dialogsUnreadBgActive
+				: context.selected
+				? st::dialogsUnreadBgOver
+				: st::dialogsUnreadBg));
+		p.drawEllipse(rect);
+		right -= st.size + st.padding;
+	} else if (badgesState.unread) {
 		UnreadBadgeStyle st;
 		st.active = context.active;
 		st.selected = context.selected;