Add confirmation for prepared giveaway start.

Telegram/Resources/langs/lang.strings

@@ -2116,6 +2116,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_giveaway_users_about" = "Choose if you want to limit the giveaway only to those who joined the channel after the giveaway started or to users from specific countries.";
 "lng_giveaway_start" = "Start Giveaway";
 "lng_giveaway_award" = "Gift Premium";
+"lng_giveaway_start_sure" = "Are you sure you want to start this prepaid giveaway now? This action cannot be undone.";
 "lng_giveaway_date_title" = "Date when giveaway ends";
 "lng_giveaway_date" = "Date and Time";
 "lng_giveaway_date_about#one" = "Choose when {count} subscriber	of your channel will be randomly selected to receive Telegram Premium.";

Telegram/SourceFiles/api/api_statistics.cpp

@@ -518,10 +518,9 @@ rpl::producer<rpl::no_value, QString> Boosts::request() {
 				? (100. * premiumMemberCount / participantCount)
 				: 0;
 
+			const auto slots = data.vmy_boost_slots();
 			_boostStatus.overview = Data::BoostsOverview{
-				.mine = (data.vmy_boost_slots()
-					? data.vmy_boost_slots()->v.size()
-					: 0),
+				.mine = slots ? int(slots->v.size()) : 0,
 				.level = std::max(data.vlevel().v, 0),
 				.boostCount = std::max(
 					data.vboosts().v,

Telegram/SourceFiles/boxes/peers/replace_boost_box.cpp

@@ -413,7 +413,7 @@ Ui::BoostCounters ParseBoostCounters(
 		.boosts = data.vboosts().v,
 		.thisLevelBoosts = data.vcurrent_level_boosts().v,
 		.nextLevelBoosts = data.vnext_level_boosts().value_or_empty(),
-		.mine = slots ? slots->v.size() : 0,
+		.mine = slots ? int(slots->v.size()) : 0,
 	};
 }
 

Telegram/SourceFiles/info/boosts/create_giveaway_box.cpp

@@ -25,6 +25,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "settings/settings_common.h"
 #include "settings/settings_premium.h" // Settings::ShowPremium
 #include "ui/boxes/choose_date_time.h"
+#include "ui/boxes/confirm_box.h"
 #include "ui/effects/premium_graphics.h"
 #include "ui/effects/premium_top_bar.h"
 #include "ui/layers/generic_box.h"
@@ -908,18 +909,37 @@ void CreateGiveawayBox(
 					state->confirmButtonBusy = false;
 				}
 			};
-			if (prepaid) {
+			const auto startPrepaid = [=](Fn<void()> close) {
+				if (!weak) {
+					close();
+					return;
+				}
 				state->apiOptions.applyPrepaid(
 					invoice,
 					prepaid->id
 				) | rpl::start_with_error_done([=](const QString &error) {
 					if (const auto window = weakWindow.get()) {
 						window->uiShow()->showToast(error);
+						close();
 						done(Payments::CheckoutResult::Cancelled);
 					}
 				}, [=] {
+					close();
 					done(Payments::CheckoutResult::Paid);
 				}, box->lifetime());
+			};
+			if (prepaid) {
+				const auto cancel = [=](Fn<void()> close) {
+					if (weak) {
+						state->confirmButtonBusy = false;
+					}
+					close();
+				};
+				show->show(Ui::MakeConfirmBox({
+					.text = tr::lng_giveaway_start_sure(tr::now),
+					.confirmed = startPrepaid,
+					.cancelled = cancel,
+				}));
 			} else {
 				Payments::CheckoutProcess::Start(std::move(invoice), done);
 			}