Fix pattern caching on themed chat open.

Telegram/SourceFiles/api/api_premium.cpp

@@ -911,6 +911,7 @@ std::optional<Data::StarGift> FromTL(
 				.starsForResale = FindStarsForResale(data.vresell_amount()),
 				.number = data.vnum().v,
 				.onlyAcceptTon = data.is_resale_ton_only(),
+				.canBeTheme = data.is_theme_available(),
 				.model = *model,
 				.pattern = *pattern,
 				.value = (data.vvalue_amount()

Telegram/SourceFiles/data/data_star_gift.h

@@ -67,6 +67,7 @@ struct UniqueGift {
 	int starsForTransfer = -1;
 	int number = 0;
 	bool onlyAcceptTon = false;
+	bool canBeTheme = false;
 	TimeId exportAt = 0;
 	TimeId canTransferAt = 0;
 	TimeId canResellAt = 0;

Telegram/SourceFiles/ui/chat/chat_theme.cpp

@@ -535,7 +535,8 @@ bool ChatTheme::readyForBackgroundRotation() const {
 }
 
 void ChatTheme::generateNextBackgroundRotation() {
-	if (_backgroundCachingRequest
+	if (_nextCachingRequest
+		|| _backgroundCachingRequest
 		|| !_backgroundNext.image.isNull()
 		|| !readyForBackgroundRotation()
 		|| background().colors.size() < 3) {
@@ -548,8 +549,9 @@ void ChatTheme::generateNextBackgroundRotation() {
 	if (!request) {
 		return;
 	}
+	_nextCachingRequest = request;
 	cacheBackgroundAsync(request, [=](CacheBackgroundResult &&result) {
-		const auto forRequest = base::take(_backgroundCachingRequest);
+		const auto forRequest = base::take(_nextCachingRequest);
 		if (!readyForBackgroundRotation()) {
 			return;
 		}
@@ -601,7 +603,9 @@ void ChatTheme::cacheBackgroundNow() {
 void ChatTheme::cacheBackgroundAsync(
 		const CacheBackgroundRequest &request,
 		Fn<void(CacheBackgroundResult&&)> done) {
-	_backgroundCachingRequest = request;
+	if (!done) {
+		_backgroundCachingRequest = request;
+	}
 	const auto weak = base::make_weak(this);
 	crl::async([=] {
 		if (!weak) {

Telegram/SourceFiles/ui/chat/chat_theme.h

@@ -202,7 +202,9 @@ private:
 	BackgroundState _backgroundState;
 	Animations::Simple _backgroundFade;
 	CacheBackgroundRequest _backgroundCachingRequest;
+	CacheBackgroundRequest _nextCachingRequest;
 	CacheBackgroundResult _backgroundNext;
+	int _backgroundVersion = 0;
 	QSize _cacheBackgroundArea;
 	crl::time _lastBackgroundAreaChangeTime = 0;
 	std::optional<base::Timer> _cacheBackgroundTimer;