From d7e2046ef3ad734593267527e4126e8aa526d624 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Mon, 21 Aug 2023 13:14:22 +0200
Subject: [PATCH] Fix maximize/fullscreen of pinned-to-top livestream.

---
 .../calls/group/calls_group_panel.cpp         | 25 +++++++++++++++++++
 .../calls/group/calls_group_panel.h           |  1 +
 2 files changed, 26 insertions(+)

diff --git a/Telegram/SourceFiles/calls/group/calls_group_panel.cpp b/Telegram/SourceFiles/calls/group/calls_group_panel.cpp
index d07c748f4..210eb0dce 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_panel.cpp
+++ b/Telegram/SourceFiles/calls/group/calls_group_panel.cpp
@@ -146,6 +146,23 @@ Main::Session &Show::session() const {
 	return panel->call()->peer()->session();
 }
 
+#ifdef Q_OS_WIN
+void UnpinMaximized(not_null<QWidget*> widget) {
+	SetWindowPos(
+		reinterpret_cast<HWND>(widget->window()->windowHandle()->winId()),
+		HWND_NOTOPMOST,
+		0,
+		0,
+		0,
+		0,
+		(SWP_NOMOVE
+			| SWP_NOSIZE
+			| SWP_NOOWNERZORDER
+			| SWP_FRAMECHANGED
+			| SWP_NOACTIVATE));
+}
+#endif // Q_OS_WIN
+
 } // namespace
 
 struct Panel::ControlsBackgroundNarrow {
@@ -1257,7 +1274,12 @@ void Panel::createPinOnTop() {
 
 		_pinOnTop->setVisible(!fullScreenOrMaximized);
 		if (fullScreenOrMaximized) {
+#ifdef Q_OS_WIN
+			UnpinMaximized(window());
+			_unpinnedMaximized = true;
+#else // Q_OS_WIN
 			pin(false);
+#endif // Q_OS_WIN
 
 			_viewport->rp()->events(
 			) | rpl::filter([](not_null<QEvent*> event) {
@@ -1269,6 +1291,9 @@ void Panel::createPinOnTop() {
 
 			_hideControlsTimer.callOnce(kHideControlsTimeout);
 		} else {
+			if (_unpinnedMaximized) {
+				pin(false);
+			}
 			_hideControlsTimerLifetime.destroy();
 			_hideControlsTimer.cancel();
 			refreshTitleGeometry();
diff --git a/Telegram/SourceFiles/calls/group/calls_group_panel.h b/Telegram/SourceFiles/calls/group/calls_group_panel.h
index 8fab14540..cf9352697 100644
--- a/Telegram/SourceFiles/calls/group/calls_group_panel.h
+++ b/Telegram/SourceFiles/calls/group/calls_group_panel.h
@@ -228,6 +228,7 @@ private:
 	const std::unique_ptr<Ui::LayerManager> _layerBg;
 	rpl::variable<PanelMode> _mode;
 	rpl::variable<bool> _fullScreenOrMaximized = false;
+	bool _unpinnedMaximized = false;
 
 #ifndef Q_OS_MAC
 	rpl::variable<int> _controlsTop = 0;