Added behavior to hide spoilers when switching sections.

Telegram/SourceFiles/data/data_session.cpp

@@ -1596,6 +1596,25 @@ void Session::unloadHeavyViewParts(
 	}
 }
 
+void Session::registerShownSpoiler(FullMsgId id) {
+	if (const auto item = message(id)) {
+		_shownSpoilers.emplace(item);
+	}
+}
+
+void Session::unregisterShownSpoiler(FullMsgId id) {
+	if (const auto item = message(id)) {
+		_shownSpoilers.remove(item);
+	}
+}
+
+void Session::hideShownSpoilers() {
+	for (const auto &item : _shownSpoilers) {
+		item->hideSpoilers();
+	}
+	_shownSpoilers = base::flat_set<not_null<HistoryItem*>>();
+}
+
 void Session::removeMegagroupParticipant(
 		not_null<ChannelData*> channel,
 		not_null<UserData*> user) {

Telegram/SourceFiles/data/data_session.h

@@ -282,6 +282,10 @@ public:
 		int from,
 		int till);
 
+	void registerShownSpoiler(FullMsgId id);
+	void unregisterShownSpoiler(FullMsgId id);
+	void hideShownSpoilers();
+
 	using MegagroupParticipant = std::tuple<
 		not_null<ChannelData*>,
 		not_null<UserData*>>;
@@ -943,6 +947,8 @@ private:
 	rpl::event_stream<InviteToCall> _invitesToCalls;
 	base::flat_map<uint64, base::flat_set<not_null<UserData*>>> _invitedToCallUsers;
 
+	base::flat_set<not_null<HistoryItem*>> _shownSpoilers;
+
 	History *_topPromoted = nullptr;
 
 	NotifySettings _defaultUserNotifySettings;

Telegram/SourceFiles/history/history_item.h

@@ -333,6 +333,8 @@ public:
 	virtual void setRealId(MsgId newId);
 	virtual void incrementReplyToTopCounter() {
 	}
+	virtual void hideSpoilers() {
+	}
 
 	[[nodiscard]] bool emptyText() const {
 		return _text.isEmpty();

Telegram/SourceFiles/history/history_message.cpp

@@ -998,6 +998,10 @@ void HistoryMessage::setCommentsItemId(FullMsgId id) {
 	}
 }
 
+void HistoryMessage::hideSpoilers() {
+	HistoryView::HideSpoilers(_text);
+}
+
 bool HistoryMessage::updateDependencyItem() {
 	if (const auto reply = Get<HistoryMessageReply>()) {
 		const auto documentId = reply->replyToDocumentId;

Telegram/SourceFiles/history/history_message.h

@@ -201,6 +201,7 @@ public:
 	[[nodiscard]] MsgId dependencyMsgId() const override {
 		return replyToId();
 	}
+	void hideSpoilers() override;
 
 	void applySentMessage(const MTPDmessage &data) override;
 	void applySentMessage(

Telegram/SourceFiles/history/history_service.cpp

@@ -998,6 +998,10 @@ void HistoryService::setServiceText(const PreparedText &prepared) {
 	_textHeight = 0;
 }
 
+void HistoryService::hideSpoilers() {
+	HistoryView::HideSpoilers(_text);
+}
+
 void HistoryService::markMediaAsReadHook() {
 	if (const auto selfdestruct = Get<HistoryServiceSelfDestruct>()) {
 		if (!selfdestruct->destructAt) {

Telegram/SourceFiles/history/history_service.h

@@ -120,6 +120,8 @@ public:
 
 	void setServiceText(const PreparedText &prepared);
 
+	void hideSpoilers() override;
+
 	~HistoryService();
 
 protected:

Telegram/SourceFiles/history/history_widget.cpp

@@ -2007,6 +2007,7 @@ void HistoryWidget::showHistory(
 			return;
 		} else {
 			session().data().sponsoredMessages().clearItems(_history);
+			session().data().hideShownSpoilers();
 		}
 		session().sendProgressManager().update(
 			_history,

Telegram/SourceFiles/history/view/history_view_spoiler_click_handler.cpp

@@ -8,7 +8,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_spoiler_click_handler.h"
 
 #include "core/click_handler_types.h" // ClickHandlerContext
+#include "data/data_session.h"
 #include "history/view/history_view_element.h"
+#include "main/main_session.h"
+#include "window/window_session_controller.h"
 #include "ui/spoiler_click_handler.h"
 
 namespace HistoryView {
@@ -33,6 +36,10 @@ void AnimatedSpoilerClickHandler::onClick(ClickContext context) const {
 		const auto nonconst = const_cast<AnimatedSpoilerClickHandler*>(this);
 		nonconst->setStartMs(crl::now());
 		SpoilerClickHandler::onClick({});
+
+		if (const auto controller = my.sessionWindow.get()) {
+			controller->session().data().registerShownSpoiler(my.itemId);
+		}
 	}
 }
 
@@ -46,4 +53,10 @@ void FillTextWithAnimatedSpoilers(Ui::Text::String &text) {
 	}
 }
 
+void HideSpoilers(Ui::Text::String &text) {
+	for (auto i = 0; i < text.spoilersCount(); i++) {
+		text.setSpoilerShown(i + 1, false);
+	}
+}
+
 } // namespace HistoryView

Telegram/SourceFiles/history/view/history_view_spoiler_click_handler.h

@@ -10,5 +10,6 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 namespace HistoryView {
 
 void FillTextWithAnimatedSpoilers(Ui::Text::String &text);
+void HideSpoilers(Ui::Text::String &text);
 
 } // namespace HistoryView

Telegram/SourceFiles/mainwidget.cpp

@@ -1276,6 +1276,7 @@ void MainWidget::ui_showPeerHistory(
 	if (IsServerMsgId(showAtMsgId)
 		&& _mainSection
 		&& _mainSection->showMessage(peerId, params, showAtMsgId)) {
+		session().data().hideShownSpoilers();
 		return;
 	}