Added auto-scroll-inactive-chat option.

Telegram/SourceFiles/history/history_widget.cpp

@@ -122,6 +122,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "media/player/media_player_instance.h"
 #include "core/application.h"
 #include "apiwrap.h"
+#include "base/options.h"
 #include "base/qthelp_regex.h"
 #include "ui/boxes/report_box.h"
 #include "ui/chat/pinned_bar.h"
@@ -165,6 +166,9 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include <QtGui/QWindow>
 #include <QtCore/QMimeData>
 
+const char kOptionAutoScrollInactiveChat[] =
+	"auto-scroll-inactive-chat";
+
 namespace {
 
 constexpr auto kMessagesPerPageFirst = 30;
@@ -185,6 +189,13 @@ constexpr auto kCommonModifiers = 0
 	| Qt::ControlModifier;
 const auto kPsaAboutPrefix = "cloud_lng_about_psa_";
 
+base::options::toggle AutoScrollInactiveChat({
+	.id = kOptionAutoScrollInactiveChat,
+	.name = "Enable auto-scroll of inactive chat",
+	.description = "Enable auto-scrolling chat for new messages, "
+		"even when the window is not in focus.",
+});
+
 [[nodiscard]] crl::time CountToastDuration(const TextWithEntities &text) {
 	return std::clamp(
 		crl::time(1000) * int(text.text.size()) / 14,
@@ -5434,6 +5445,9 @@ int HistoryWidget::countAutomaticScrollTop() {
 	Expects(_list != nullptr);
 
 	if (const auto unread = _history->firstUnreadMessage()) {
+		if (AutoScrollInactiveChat.value()) {
+			return ScrollMax;
+		}
 		const auto firstUnreadTop = _list->itemTop(unread);
 		const auto possibleUnreadBarTop = _scroll->scrollTopMax()
 			+ HistoryView::UnreadBar::height()

Telegram/SourceFiles/history/history_widget.h

@@ -122,6 +122,8 @@ class MessageField;
 class HistoryInner;
 struct HistoryMessageMarkupButton;
 
+extern const char kOptionAutoScrollInactiveChat[];
+
 class HistoryWidget final : public Window::AbstractSectionWidget {
 public:
 	using FieldHistoryAction = Ui::InputField::HistoryAction;

Telegram/SourceFiles/settings/settings_experimental.cpp

@@ -16,6 +16,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "base/options.h"
 #include "core/application.h"
 #include "chat_helpers/tabbed_panel.h"
+#include "history/history_widget.h"
 #include "lang/lang_keys.h"
 #include "media/player/media_player_instance.h"
 #include "webview/webview_embed.h"
@@ -137,6 +138,7 @@ void SetupExperimental(
 	addToggle(Media::Player::kOptionDisableAutoplayNext);
 	addToggle(Settings::kOptionMonoSettingsIcons);
 	addToggle(Webview::kOptionWebviewDebugEnabled);
+	addToggle(kOptionAutoScrollInactiveChat);
 }
 
 } // namespace