Allow sharing video at a timestamp.

Telegram/SourceFiles/boxes/share_box.cpp

@@ -277,7 +277,9 @@ void ShareBox::prepare() {
 	_select->resizeToWidth(st::boxWideWidth);
 	Ui::SendPendingMoveResizeEvents(_select);
 
-	setTitle(tr::lng_share_title());
+	setTitle(_descriptor.titleOverride
+		? std::move(_descriptor.titleOverride)
+		: tr::lng_share_title());
 
 	_inner = setInnerWidget(
 		object_ptr<Inner>(this, _descriptor, uiShow()),
@@ -1495,7 +1497,8 @@ ChatHelpers::ForwardedMessagePhraseArgs CreateForwardedMessagePhraseArgs(
 ShareBox::SubmitCallback ShareBox::DefaultForwardCallback(
 		std::shared_ptr<Ui::Show> show,
 		not_null<History*> history,
-		MessageIdsList msgIds) {
+		MessageIdsList msgIds,
+		std::optional<TimeId> videoTimestamp) {
 	struct State final {
 		base::flat_set<mtpRequestId> requests;
 	};
@@ -1531,6 +1534,9 @@ ShareBox::SubmitCallback ShareBox::DefaultForwardCallback(
 				: Flag(0))
 			| ((forwardOptions == Data::ForwardOptions::NoNamesAndCaptions)
 				? Flag::f_drop_media_captions
+				: Flag(0))
+			| (videoTimestamp.has_value()
+				? Flag::f_video_timestamp
 				: Flag(0));
 		auto mtpMsgIds = QVector<MTPint>();
 		mtpMsgIds.reserve(existingIds.size());
@@ -1588,7 +1594,7 @@ ShareBox::SubmitCallback ShareBox::DefaultForwardCallback(
 						MTP_int(options.scheduled),
 						MTP_inputPeerEmpty(), // send_as
 						Data::ShortcutIdToMTP(session, options.shortcutId),
-						MTPint() // video_timestamp
+						MTP_int(videoTimestamp.value_or(0))
 				)).done([=](const MTPUpdates &updates, mtpRequestId reqId) {
 					threadHistory->session().api().applyUpdates(updates);
 					state->requests.remove(reqId);