Build fixed for Linux, checking for compositing manager running.

Backported QX11Info::isCompositingManagerRunning from Qt 5.7.

Telegram/Patches/qtbase_5_6_2.diff

@@ -11896,6 +11896,52 @@ index 6fffa1e..cb1c9c1 100644
      void destroyWindow();
      inline bool isDropSiteEnabled() const { return m_dropTarget != 0; }
      void setDropSiteEnabled(bool enabled);
+diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
+index 09e7ecf..c0f15a4 100644
+--- a/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
++++ b/src/plugins/platforms/xcb/qxcbnativeinterface.cpp
+@@ -79,7 +79,10 @@ static int resourceType(const QByteArray &key)
+         QByteArrayLiteral("rootwindow"),
+         QByteArrayLiteral("subpixeltype"), QByteArrayLiteral("antialiasingenabled"),
+         QByteArrayLiteral("nofonthinting"),
+-        QByteArrayLiteral("atspibus")
++        QByteArrayLiteral("atspibus"),
++
++        // Patch: Backport compositing manager check from Qt 5.7
++        QByteArrayLiteral("compositingenabled")
+     };
+     const QByteArray *end = names + sizeof(names) / sizeof(names[0]);
+     const QByteArray *result = std::find(names, end, key);
+@@ -252,6 +255,13 @@ void *QXcbNativeInterface::nativeResourceForScreen(const QByteArray &resourceStr
+     case RootWindow:
+         result = reinterpret_cast<void *>(xcbScreen->root());
+         break;
++
++    // Patch: Backport compositing manager check from Qt 5.7
++    case CompositingEnabled:
++        if (QXcbVirtualDesktop *vd = xcbScreen->virtualDesktop())
++            result = vd->compositingActive() ? this : Q_NULLPTR;
++        break;
++
+     default:
+         break;
+     }
+diff --git a/src/plugins/platforms/xcb/qxcbnativeinterface.h b/src/plugins/platforms/xcb/qxcbnativeinterface.h
+index f88b710..6f818a5 100644
+--- a/src/plugins/platforms/xcb/qxcbnativeinterface.h
++++ b/src/plugins/platforms/xcb/qxcbnativeinterface.h
+@@ -68,7 +68,10 @@ public:
+         ScreenSubpixelType,
+         ScreenAntialiasingEnabled,
+         NoFontHinting,
+-        AtspiBus
++        AtspiBus,
++
++        // Patch: Backport compositing manager check from Qt 5.7
++        CompositingEnabled
+     };
+ 
+     QXcbNativeInterface();
 diff --git a/src/widgets/dialogs/qfiledialog.cpp b/src/widgets/dialogs/qfiledialog.cpp
 index bc2de89..aa8f8df 100644
 --- a/src/widgets/dialogs/qfiledialog.cpp

Telegram/SourceFiles/platform/linux/main_window_linux.cpp

@@ -61,7 +61,7 @@ void _trayIconActivate(GtkStatusIcon *status_icon, gpointer popup_menu) {
 
 gboolean _trayIconResized(GtkStatusIcon *status_icon, gint size, gpointer popup_menu) {
 	_trayIconSize = size;
-	if (App::wnd()) App::wnd()->psUpdateCounter();
+	if (Global::started()) Notify::unreadCounterUpdated();
 	return FALSE;
 }
 
@@ -166,7 +166,7 @@ static gboolean _trayIconCheck(gpointer/* pIn*/) {
 			cSetSupportTray(true);
 			if (App::wnd()) {
 				App::wnd()->psUpdateWorkmode();
-				App::wnd()->psUpdateCounter();
+				Notify::unreadCounterUpdated();
 				App::wnd()->updateTrayMenu();
 			}
 		}
@@ -239,7 +239,7 @@ void MainWindow::psTrayMenuUpdated() {
 void MainWindow::psSetupTrayIcon() {
 	if (noQtTrayIcon) {
 		if (!cSupportTray()) return;
-		psUpdateCounter();
+		updateIconCounters();
 	} else {
 		LOG(("Using Qt tray icon."));
 		if (!trayIcon) {
@@ -266,7 +266,7 @@ void MainWindow::psSetupTrayIcon() {
 
 			App::wnd()->updateTrayMenu();
 		}
-		psUpdateCounter();
+		updateIconCounters();
 
 		trayIcon->show();
 	}
@@ -315,12 +315,16 @@ void MainWindow::psUpdateIndicator() {
 	}
 }
 
-void MainWindow::psUpdateCounter() {
+void MainWindow::unreadCounterChangedHook() {
+	setWindowTitle(titleText());
+	updateIconCounters();
+}
+
+void MainWindow::updateIconCounters() {
 	setWindowIcon(wndIcon);
 
 	int32 counter = App::histories().unreadBadge();
 
-	setWindowTitle((counter > 0) ? qsl("Telegram (%1)").arg(counter) : qsl("Telegram"));
 #ifndef TDESKTOP_DISABLE_UNITY_INTEGRATION
 	if (_psUnityLauncherEntry) {
 		if (counter > 0) {

Telegram/SourceFiles/platform/linux/main_window_linux.h

@@ -74,6 +74,7 @@ protected:
 	virtual void placeSmallCounter(QImage &img, int size, int count, const style::color &bg, const QPoint &shift, const style::color &color) = 0;
 
 private:
+	void updateIconCounters();
 	void psCreateTrayIcon();
 
 	QTimer _psCheckStatusIconTimer;
@@ -81,6 +82,7 @@ private:
 
 	QTimer _psUpdateIndicatorTimer;
 	uint64 _psLastIndicatorUpdate = 0;
+
 };
 
 } // namespace Platform

Telegram/SourceFiles/pspecific.h

@@ -36,6 +36,7 @@ void start();
 void finish();
 
 void SetWatchingMediaKeys(bool watching);
+bool TransparentWindowsSupported(QPoint globalPosition);
 
 namespace ThirdParty {
 

Telegram/SourceFiles/pspecific_linux.cpp

@@ -34,6 +34,8 @@ Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
 
 #include <iostream>
 
+#include <qpa/qplatformnativeinterface.h>
+
 using namespace Platform;
 
 namespace {
@@ -409,6 +411,31 @@ void finish() {
 void SetWatchingMediaKeys(bool watching) {
 }
 
+bool TransparentWindowsSupported(QPoint globalPosition) {
+	if (auto app = static_cast<QGuiApplication*>(QCoreApplication::instance())) {
+		if (auto native = app->platformNativeInterface()) {
+			if (auto desktop = QApplication::desktop()) {
+				auto index = desktop->screenNumber(globalPosition);
+				auto screens = QGuiApplication::screens();
+				if (auto screen = (index >= 0 && index < screens.size()) ? screens[index] : QGuiApplication::primaryScreen()) {
+					if (native->nativeResourceForScreen(QByteArray("compositingEnabled"), screen)) {
+						return true;
+					}
+
+					static OrderedSet<int> WarnedAbout;
+					if (!WarnedAbout.contains(index)) {
+						WarnedAbout.insert(index);
+						LOG(("WARNING: Compositing is disabled for screen index %1 (for position %2,%3)").arg(index).arg(globalPosition.x()).arg(globalPosition.y()));
+					}
+				} else {
+					LOG(("WARNING: Could not get screen for index %1 (for position %2,%3)").arg(index).arg(globalPosition.x()).arg(globalPosition.y()));
+				}
+			}
+		}
+	}
+	return false;
+}
+
 namespace ThirdParty {
 
 void start() {

Telegram/SourceFiles/pspecific_mac.cpp

@@ -405,6 +405,10 @@ void finish() {
 	objc_finish();
 }
 
+bool TransparentWindowsSupported(QPoint globalPosition) {
+        return true;
+}
+
 namespace ThirdParty {
 
 void start() {

Telegram/SourceFiles/pspecific_win.cpp

@@ -732,6 +732,10 @@ void finish() {
 void SetWatchingMediaKeys(bool watching) {
 }
 
+bool TransparentWindowsSupported(QPoint globalPosition) {
+	return true;
+}
+
 namespace ThirdParty {
 
 void start() {

Telegram/SourceFiles/ui/widgets/popup_menu.cpp

@@ -68,7 +68,7 @@ void PopupMenu::init() {
 }
 
 void PopupMenu::handleCompositingUpdate() {
-	_padding = _compositing ? _st.shadow.extend : style::margins(st::lineWidth, st::lineWidth, st::lineWidth, st::lineWidth);
+	_padding = _useTransaprency ? _st.shadow.extend : style::margins(st::lineWidth, st::lineWidth, st::lineWidth, st::lineWidth);
 	_menu->moveToLeft(_padding.left() + _st.scrollPadding.left(), _padding.top() + _st.scrollPadding.top());
 	handleMenuResize();
 }
@@ -126,7 +126,7 @@ void PopupMenu::paintEvent(QPaintEvent *e) {
 }
 
 void PopupMenu::paintBg(Painter &p) {
-	if (_compositing) {
+	if (_useTransaprency) {
 		Shadow::paint(p, _inner, width(), _st.shadow);
 		App::roundRect(p, _inner, _st.menu.itemBg, ImageRoundRadius::Small);
 	} else {
@@ -307,7 +307,7 @@ void PopupMenu::prepareCache() {
 
 void PopupMenu::startOpacityAnimation(bool hiding) {
 	_hiding = false;
-	if (!_compositing) {
+	if (!_useTransaprency) {
 		_a_opacity.finish();
 		if (hiding) {
 			hideFinished();
@@ -334,7 +334,7 @@ void PopupMenu::showStarted() {
 }
 
 void PopupMenu::startShowAnimation() {
-	if (!_compositing) {
+	if (!_useTransaprency) {
 		_a_show.finish();
 		update();
 		return;
@@ -347,7 +347,7 @@ void PopupMenu::startShowAnimation() {
 
 		_showAnimation = std_::make_unique<PanelAnimation>(_st.animation, _origin);
 		_showAnimation->setFinalImage(std_::move(cache), _inner);
-		if (_compositing) {
+		if (_useTransaprency) {
 			auto corners = App::cornersMask(ImageRoundRadius::Small);
 			_showAnimation->setCornerMasks(QImage(*corners[0]), QImage(*corners[1]), QImage(*corners[2]), QImage(*corners[3]));
 		} else {
@@ -382,7 +382,7 @@ QImage PopupMenu::grabForPanelAnimation() {
 	result.fill(Qt::transparent);
 	{
 		Painter p(&result);
-		if (_compositing) {
+		if (_useTransaprency) {
 			App::roundRect(p, _inner, _st.menu.itemBg, ImageRoundRadius::Small);
 		} else {
 			p.fillRect(_inner, _st.menu.itemBg);
@@ -410,11 +410,7 @@ void PopupMenu::showMenu(const QPoint &p, PopupMenu *parent, TriggeredSource sou
 	auto origin = PanelAnimation::Origin::TopLeft;
 	auto w = p - QPoint(0, _padding.top());
 	auto r = Sandbox::screenGeometry(p);
-#ifdef Q_OS_LINUX
+	_useTransaprency = Platform::TransparentWindowsSupported(p);
-	_compositing = QX11Info::isCompositingManagerRunning(QApplication::desktop()->screenNumber(p));
-#else // Q_OS_LINUX
-	_compositing = true;
-#endif // Q_OS_LINUX
 	handleCompositingUpdate();
 	if (rtl()) {
 		if (w.x() - width() < r.x() - _padding.left()) {

Telegram/SourceFiles/ui/widgets/popup_menu.h

@@ -117,7 +117,7 @@ private:
 	std_::unique_ptr<PanelAnimation> _showAnimation;
 	FloatAnimation _a_show;
 
-	bool _compositing = true;
+	bool _useTransaprency = true;
 	bool _hiding = false;
 	QPixmap _cache;
 	FloatAnimation _a_opacity;