Fix export messages pagination.

Also fix reply highlight.
Also fix channel service messages.
Also improve single chat export progress display.

Telegram/Resources/export_html/css/style.css

@@ -275,7 +275,7 @@ div.selected {
     padding: 10px;
 }
 .default.joined {
-    padding-top: 0;
+    margin-top: -10px;
 }
 .default .from_name {
     color: #3892db;

Telegram/SourceFiles/export/output/export_output_html.cpp

@@ -958,6 +958,9 @@ auto HtmlWriter::Wrap::pushMessage(
 		return wrapMessageLink(message.replyToMsgId, text);
 	};
 
+	using DialogType = Data::DialogInfo::Type;
+	const auto isChannel = (dialog.type == DialogType::PrivateChannel)
+		|| (dialog.type == DialogType::PublicChannel);
 	const auto serviceFrom = peers.wrapUserName(message.fromId);
 	const auto serviceText = message.action.content.match(
 	[&](const ActionChatCreate &data) {
@@ -967,14 +970,20 @@ auto HtmlWriter::Wrap::pushMessage(
 				? QByteArray()
 				: " with members " + peers.wrapUserNames(data.userIds));
 	}, [&](const ActionChatEditTitle &data) {
-		return serviceFrom
-			+ " changed group title to «" + data.title + "»";
+		return isChannel
+			? ("Channel title changed to «" + data.title + "»")
+			: (serviceFrom
+				+ " changed group title to «"
+				+ data.title
+				+ "»");
 	}, [&](const ActionChatEditPhoto &data) {
-		return serviceFrom
-			+ " changed group photo";
+		return isChannel
+			? QByteArray("Channel photo changed")
+			: (serviceFrom + " changed group photo");
 	}, [&](const ActionChatDeletePhoto &data) {
-		return serviceFrom
-			+ " deleted group photo";
+		return isChannel
+			? QByteArray("Channel photo removed")
+			: (serviceFrom + " removed group photo");
 	}, [&](const ActionChatAddUser &data) {
 		return serviceFrom
 			+ " invited "
@@ -2263,7 +2272,9 @@ Result HtmlWriter::writeDialogSlice(const Data::MessagesSlice &data) {
 	const auto messageLinkWrapper = [&](int messageId, QByteArray text) {
 		return wrapMessageLink(messageId, text);
 	};
-	auto oldIndex = (_messagesCount / kMessagesInFile);
+	auto oldIndex = (_messagesCount > 0)
+		? ((_messagesCount - 1) / kMessagesInFile)
+		: 0;
 	auto previous = _lastMessageInfo.get();
 	auto saved = base::optional<MessageInfo>();
 	auto block = QByteArray();

Telegram/SourceFiles/export/view/export_view_content.cpp

@@ -41,10 +41,16 @@ Content ContentFromState(const ProcessingState &state) {
 		const auto done = state.substepsPassed;
 		const auto add = state.substepsNow;
 		const auto doneProgress = done / float64(substepsTotal);
-		const auto addProgress = (state.entityCount > 0)
-			? ((float64(add) * state.entityIndex)
-				/ (float64(substepsTotal) * state.entityCount))
-			: 0.;
+		const auto addPart = [&](int index, int count) {
+			return (count > 0)
+				? ((float64(add) * index)
+					/ (float64(substepsTotal) * count))
+				: 0.;
+		};
+		const auto addProgress = (state.entityCount == 1
+			&& !state.entityIndex)
+			? addPart(state.itemIndex, state.itemCount)
+			: addPart(state.entityIndex, state.entityCount);
 		push("main", label, info, doneProgress + addProgress);
 	};
 	const auto pushBytes = [&](const QString &id, const QString &label) {