Improve single chat export progress display.

Telegram/SourceFiles/export/view/export_view_content.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "export/view/export_view_content.h"
 
+#include "export/export_settings.h"
 #include "lang/lang_keys.h"
 #include "layout.h"
 
@@ -15,7 +16,9 @@ namespace View {
 
 const QString Content::kDoneId = "done";
 
-Content ContentFromState(const ProcessingState &state) {
+Content ContentFromState(
+		not_null<Settings*> settings,
+		const ProcessingState &state) {
 	using Step = ProcessingState::Step;
 
 	auto result = Content();
@@ -89,7 +92,9 @@ Content ContentFromState(const ProcessingState &state) {
 		pushMain(tr::lng_export_option_other(tr::now));
 		break;
 	case Step::Dialogs:
-		pushMain(tr::lng_export_state_chats(tr::now));
+		if (state.entityCount > 1) {
+			pushMain(tr::lng_export_state_chats(tr::now));
+		}
 		push(
 			"chat" + QString::number(state.entityIndex),
 			(state.entityName.isEmpty()
@@ -114,7 +119,8 @@ Content ContentFromState(const ProcessingState &state) {
 		break;
 	default: Unexpected("Step in ContentFromState.");
 	}
-	while (result.rows.size() < 3) {
+	const auto requiredRows = settings->onlySinglePeer() ? 2 : 3;
+	while (result.rows.size() < requiredRows) {
 		result.rows.emplace_back();
 	}
 	return result;

Telegram/SourceFiles/export/view/export_view_content.h

@@ -9,6 +9,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "export/export_controller.h"
 
+namespace Export {
+struct Settings;
+} // namespace Export
+
 namespace Export {
 namespace View {
 
@@ -26,17 +30,21 @@ struct Content {
 
 };
 
-Content ContentFromState(const ProcessingState &state);
+[[nodiscard]] Content ContentFromState(
-Content ContentFromState(const FinishedState &state);
+	not_null<Settings*> settings,
+	const ProcessingState &state);
+[[nodiscard]] Content ContentFromState(const FinishedState &state);
 
-inline auto ContentFromState(rpl::producer<State> state) {
+[[nodiscard]] inline auto ContentFromState(
+		not_null<Settings*> settings,
+		rpl::producer<State> state) {
 	return std::move(
 		state
 	) | rpl::filter([](const State &state) {
 		return state.is<ProcessingState>() || state.is<FinishedState>();
-	}) | rpl::map([](const State &state) {
+	}) | rpl::map([=](const State &state) {
 		if (const auto process = base::get_if<ProcessingState>(&state)) {
-			return ContentFromState(*process);
+			return ContentFromState(settings, *process);
 		} else if (const auto done = base::get_if<FinishedState>(&state)) {
 			return ContentFromState(*done);
 		}

Telegram/SourceFiles/export/view/export_view_panel_controller.cpp

@@ -280,7 +280,7 @@ void PanelController::showProgress() {
 	auto progress = base::make_unique_q<ProgressWidget>(
 		_panel.get(),
 		rpl::single(
-			ContentFromState(ProcessingState())
+			ContentFromState(_settings.get(), ProcessingState())
 		) | rpl::then(progressState()));
 
 	progress->cancelClicks(

Telegram/SourceFiles/export/view/export_view_panel_controller.h

@@ -46,7 +46,7 @@ public:
 	}
 
 	auto progressState() const {
-		return ContentFromState(_process->state());
+		return ContentFromState(_settings.get(), _process->state());
 	}
 
 private:

Telegram/SourceFiles/export/view/export_view_progress.cpp

@@ -288,6 +288,7 @@ void ProgressWidget::updateState(Content &&content) {
 		showDone();
 	}
 
+	const auto wasCount = _rows.size();
 	auto index = 0;
 	for (auto &row : content.rows) {
 		if (index < _rows.size()) {
@@ -297,12 +298,16 @@ void ProgressWidget::updateState(Content &&content) {
 				index,
 				object_ptr<Row>(this, std::move(row)),
 				st::exportProgressRowPadding));
+			_rows.back()->show();
 		}
 		++index;
 	}
 	for (const auto count = _rows.size(); index != count; ++index) {
 		_rows[index]->updateData(Content::Row());
 	}
+	if (_rows.size() != wasCount) {
+		_body->resizeToWidth(width());
+	}
 }
 
 void ProgressWidget::showDone() {