Correctly show custom themes in list.

Telegram/SourceFiles/media/view/media_view_overlay_widget.cpp

@@ -154,6 +154,10 @@ QPixmap PrepareStaticImage(const QString &path) {
 	return App::pixmapFromImageInPlace(std::move(image));
 }
 
+[[nodiscard]] QString CachedThemePath(uint64 documentId) {
+	return QString::fromLatin1("special://cached-%1").arg(documentId);
+}
+
 } // namespace
 
 struct OverlayWidget::SharedMedia {
@@ -2198,6 +2202,8 @@ void OverlayWidget::playbackWaitingChange(bool waiting) {
 }
 
 void OverlayWidget::initThemePreview() {
+	using namespace Window::Theme;
+
 	Assert(_doc && _doc->isTheme());
 
 	const auto bytes = _doc->data();
@@ -2208,10 +2214,10 @@ void OverlayWidget::initThemePreview() {
 	}
 	_themePreviewShown = true;
 
-	Window::Theme::CurrentData current;
-	current.backgroundId = Window::Theme::Background()->id();
-	current.backgroundImage = Window::Theme::Background()->createCurrentImage();
-	current.backgroundTiled = Window::Theme::Background()->tile();
+	auto current = CurrentData();
+	current.backgroundId = Background()->id();
+	current.backgroundImage = Background()->createCurrentImage();
+	current.backgroundTiled = Background()->tile();
 
 	const auto &cloudList = _doc->session().data().cloudThemes().list();
 	const auto i = ranges::find(
@@ -2221,15 +2227,14 @@ void OverlayWidget::initThemePreview() {
 	const auto cloud = (i != end(cloudList)) ? *i : Data::CloudTheme();
 	const auto isTrusted = (cloud.documentId != 0);
 
-	const auto path = _doc->location().name();
+	const auto realPath = _doc->location().name();
+	const auto path = realPath.isEmpty()
+		? CachedThemePath(_doc->id)
+		: realPath;
 	const auto id = _themePreviewId = rand_value<uint64>();
 	const auto weak = make_weak(this);
 	crl::async([=, data = std::move(current)]() mutable {
-		auto preview = Window::Theme::GeneratePreview(
-			path,
-			bytes,
-			cloud,
-			std::move(data));
+		auto preview = GeneratePreview(bytes, path, cloud, std::move(data));
 		crl::on_main(weak, [=, result = std::move(preview)]() mutable {
 			if (id != _themePreviewId) {
 				return;
@@ -2243,15 +2248,14 @@ void OverlayWidget::initThemePreview() {
 					st::themePreviewApplyButton);
 				_themeApply->show();
 				_themeApply->setClickedCallback([=] {
-					const auto &object = Window::Theme::Background()->themeObject();
-					const auto currentlyIsCustom = !object.pathAbsolute.isEmpty()
-						&& !object.pathAbsolute.startsWith(qstr(":/gui/"))
-						&& !object.cloud.id;
+					const auto &object = Background()->themeObject();
+					const auto currentlyIsCustom = !object.cloud.id
+						&& !IsEmbeddedTheme(object.pathAbsolute);
 					auto preview = std::move(_themePreview);
 					close();
-					Window::Theme::Apply(std::move(preview));
+					Apply(std::move(preview));
 					if (isTrusted && !currentlyIsCustom) {
-						Window::Theme::KeepApplied();
+						KeepApplied();
 					}
 				});
 				_themeCancel.create(

Telegram/SourceFiles/storage/localstorage.cpp

@@ -4221,7 +4221,7 @@ Window::Theme::Saved readThemeUsingKey(FileKey key) {
 
 	auto ignoreCache = false;
 	if (!object.cloud.id) {
-		QFile file(object.pathRelative);
+		auto file = QFile(object.pathRelative);
 		if (object.pathRelative.isEmpty() || !file.exists()) {
 			file.setFileName(object.pathAbsolute);
 		}
@@ -4480,9 +4480,8 @@ std::vector<Lang::Language> readRecentLanguages() {
 }
 
 bool copyThemeColorsToPalette(const QString &destination) {
-	auto &themeKey = Window::Theme::IsNightMode()
-		? _themeKeyNight
-		: _themeKeyDay;
+	using namespace Window::Theme;
+	auto &themeKey = IsNightMode() ? _themeKeyNight : _themeKeyDay;
 	if (!themeKey) {
 		return false;
 	}
@@ -4499,10 +4498,7 @@ bool copyThemeColorsToPalette(const QString &destination) {
 		return false;
 	}
 
-	return Window::Theme::CopyColorsToPalette(
-		destination,
-		pathAbsolute,
-		themeContent);
+	return CopyColorsToPalette(destination, pathAbsolute, themeContent);
 }
 
 void writeRecentHashtagsAndBots() {

Telegram/SourceFiles/window/themes/window_theme.cpp

@@ -856,6 +856,7 @@ void ChatBackground::setTileNightValue(bool tile) {
 
 void ChatBackground::setThemeObject(const Object &object) {
 	_themeObject = object;
+	_themeObject.content = QByteArray();
 }
 
 const Object &ChatBackground::themeObject() const {
@@ -1100,6 +1101,10 @@ ChatBackground *Background() {
 	return GlobalBackground.data();
 }
 
+bool IsEmbeddedTheme(const QString &path) {
+	return path.isEmpty() || path.startsWith(qstr(":/gui/"));
+}
+
 bool Initialize(Saved &&saved) {
 	if (InitializeFromSaved(std::move(saved))) {
 		Background()->setThemeObject(saved.object);
@@ -1116,7 +1121,7 @@ void Uninitialize() {
 bool Apply(
 		const QString &filepath,
 		const Data::CloudTheme &cloud) {
-	if (auto preview = PreviewFromFile(filepath, {}, cloud)) {
+	if (auto preview = PreviewFromFile(QByteArray(), filepath, cloud)) {
 		return Apply(std::move(preview));
 	}
 	return false;
@@ -1134,7 +1139,7 @@ bool Apply(std::unique_ptr<Preview> preview) {
 
 void ApplyDefaultWithPath(const QString &themePath) {
 	if (!themePath.isEmpty()) {
-		if (auto preview = PreviewFromFile(themePath, {}, {})) {
+		if (auto preview = PreviewFromFile(QByteArray(), themePath, {})) {
 			Apply(std::move(preview));
 		}
 	} else {

Telegram/SourceFiles/window/themes/window_theme.h

@@ -19,6 +19,8 @@ namespace Theme {
 
 inline constexpr auto kThemeSchemeSizeLimit = 1024 * 1024;
 
+[[nodiscard]] bool IsEmbeddedTheme(const QString &path);
+
 struct Object {
 	QString pathRelative;
 	QString pathAbsolute;

Telegram/SourceFiles/window/themes/window_theme_editor_box.cpp

@@ -216,11 +216,13 @@ void ImportFromFile(
 		qsl("Theme files (*.tdesktop-theme *.tdesktop-palette)"));
 	filters.push_back(FileDialog::AllFilesFilter());
 	const auto callback = crl::guard(session, [=](
-			const FileDialog::OpenResult &result) {
-		if (result.paths.isEmpty()) {
-			return;
+		const FileDialog::OpenResult &result) {
+		const auto path = result.paths.isEmpty()
+			? QString()
+			: result.paths.front();
+		if (!path.isEmpty()) {
+			Window::Theme::Apply(path);
 		}
-		Window::Theme::Apply(result.paths.front());
 	});
 	FileDialog::GetOpenPath(
 		parent.get(),

Telegram/SourceFiles/window/themes/window_theme_preview.cpp

@@ -909,9 +909,11 @@ void Generator::restoreTextPalette() {
 } // namespace
 
 std::unique_ptr<Preview> PreviewFromFile(
-		const QString &filepath,
 		const QByteArray &bytes,
+		const QString &filepath,
 		const Data::CloudTheme &cloud) {
+	Expects(!filepath.isEmpty()); // Use 
+
 	auto result = std::make_unique<Preview>();
 	auto &object = result->object;
 	object.cloud = cloud;
@@ -935,11 +937,11 @@ std::unique_ptr<Preview> PreviewFromFile(
 }
 
 std::unique_ptr<Preview> GeneratePreview(
-		const QString &filepath,
 		const QByteArray &bytes,
+		const QString &filepath,
 		const Data::CloudTheme &cloud,
 		CurrentData &&data) {
-	auto result = PreviewFromFile(filepath, bytes, cloud);
+	auto result = PreviewFromFile(bytes, filepath, cloud);
 	if (!result) {
 		return nullptr;
 	}

Telegram/SourceFiles/window/themes/window_theme_preview.h

@@ -23,12 +23,12 @@ struct CurrentData {
 };
 
 std::unique_ptr<Preview> PreviewFromFile(
-	const QString &filepath,
 	const QByteArray &bytes,
+	const QString &filepath,
 	const Data::CloudTheme &cloud);
 std::unique_ptr<Preview> GeneratePreview(
-	const QString &filepath,
 	const QByteArray &bytes,
+	const QString &filepath,
 	const Data::CloudTheme &cloud,
 	CurrentData &&data);
 

Telegram/SourceFiles/window/themes/window_themes_cloud_list.cpp

@@ -61,7 +61,7 @@ constexpr auto kShowPerRow = 4;
 			takeh * to.width() / to.height(),
 			1);
 		return (small.width() != takew)
-			? small.copy(0, (small.width() - takew) / 2, takew, takeh)
+			? small.copy((small.width() - takew) / 2, 0, takew, takeh)
 			: small;
 	}
 }
@@ -181,8 +181,7 @@ void CloudList::setup() {
 
 std::vector<Data::CloudTheme> CloudList::collectAll() const {
 	const auto &object = Background()->themeObject();
-	const auto isDefault = object.pathAbsolute.isEmpty()
-		|| object.pathAbsolute.startsWith(qstr(":/gui/"));
+	const auto isDefault = IsEmbeddedTheme(object.pathAbsolute);
 	auto result = _window->session().data().cloudThemes().list();
 	if (!isDefault) {
 		const auto i = ranges::find(

Telegram/SourceFiles/window/themes/window_themes_embedded.cpp

@@ -166,7 +166,7 @@ Colorizer ColorizerFrom(const EmbeddedScheme &scheme, const QColor &color) {
 }
 
 Colorizer ColorizerForTheme(const QString &absolutePath) {
-	if (!absolutePath.startsWith(qstr(":/gui"))) {
+	if (absolutePath.isEmpty() || !IsEmbeddedTheme(absolutePath)) {
 		return Colorizer();
 	}
 	const auto schemes = EmbeddedThemes();