From 5e12cd27df5cc6cc6c09ec363eba308060021337 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Fri, 20 Jan 2023 09:33:04 +0400
Subject: [PATCH] Fix web_app_request_[theme|viewport].

Fixes #25752.
---
 .../SourceFiles/ui/chat/attach/attach_bot_webview.cpp | 11 ++++++++++-
 .../SourceFiles/ui/chat/attach/attach_bot_webview.h   |  1 +
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_bot_webview.cpp b/Telegram/SourceFiles/ui/chat/attach/attach_bot_webview.cpp
index f53f8d195..36dab0d4a 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_bot_webview.cpp
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_bot_webview.cpp
@@ -356,7 +356,7 @@ Panel::Panel(
 		postEvent("back_button_pressed");
 	}, _widget->lifetime());
 
-	rpl::combine(
+	rpl::merge(
 		style::PaletteChanged(),
 		_themeUpdateForced.events()
 	) | rpl::filter([=] {
@@ -631,6 +631,8 @@ bool Panel::createWebview() {
 			processBackButtonMessage(arguments);
 		} else if (command == "web_app_request_theme") {
 			_themeUpdateForced.fire({});
+		} else if (command == "web_app_request_viewport") {
+			sendViewport();
 		} else if (command == "web_app_open_tg_link") {
 			openTgLink(arguments);
 		} else if (command == "web_app_open_link") {
@@ -675,6 +677,13 @@ postEvent: function(eventType, eventData) {
 	return true;
 }
 
+void Panel::sendViewport() {
+	postEvent("viewport_changed", "{ "
+		"height: window.innerHeight, "
+		"is_state_stable: true, "
+		"is_expanded: true }");
+}
+
 void Panel::setTitle(rpl::producer<QString> title) {
 	_widget->setTitle(std::move(title));
 }
diff --git a/Telegram/SourceFiles/ui/chat/attach/attach_bot_webview.h b/Telegram/SourceFiles/ui/chat/attach/attach_bot_webview.h
index 0acd1e71e..fe51fd319 100644
--- a/Telegram/SourceFiles/ui/chat/attach/attach_bot_webview.h
+++ b/Telegram/SourceFiles/ui/chat/attach/attach_bot_webview.h
@@ -100,6 +100,7 @@ private:
 	void createMainButton();
 	void scheduleCloseWithConfirmation();
 	void closeWithConfirmation();
+	void sendViewport();
 
 	using EventData = std::variant<QString, QJsonObject>;
 	void postEvent(const QString &event);