Allow sending videos with covers.

Telegram/SourceFiles/storage/storage_media_prepare.cpp

@@ -362,10 +362,22 @@ void UpdateImageDetails(
 
 bool ApplyModifications(PreparedList &list) {
 	auto applied = false;
-	for (auto &file : list.files) {
+	const auto apply = [&](PreparedFile &file, QSize strictSize = {}) {
 		const auto image = std::get_if<Image>(&file.information->media);
+		const auto guard = gsl::finally([&] {
+			if (!image || strictSize.isEmpty()) {
+				return;
+			}
+			applied = true;
+			file.path = QString();
+			file.content = QByteArray();
+			image->data = image->data.scaled(
+				strictSize,
+				Qt::IgnoreAspectRatio,
+				Qt::SmoothTransformation);
+		});
 		if (!image || !image->modifications) {
-			continue;
+			return;
 		}
 		applied = true;
 		file.path = QString();
@@ -373,6 +385,16 @@ bool ApplyModifications(PreparedList &list) {
 		image->data = Editor::ImageModified(
 			std::move(image->data),
 			image->modifications);
+	};
+	for (auto &file : list.files) {
+		apply(file);
+		if (const auto cover = file.videoCover.get()) {
+			const auto video = file.information
+				? std::get_if<Ui::PreparedFileInformation::Video>(
+					&file.information->media)
+				: nullptr;
+			apply(*cover, video ? video->thumbnail.size() : QSize());
+		}
 	}
 	return applied;
 }