Fix blurry App Switcher icon on macOS.

Fixes #5267.

Telegram/SourceFiles/messenger.cpp

@@ -585,7 +585,7 @@ void Messenger::startLocalStorage() {
 			if (_mtproto) {
 				_mtproto->requestConfig();
 			}
-			qApp->setWindowIcon(Window::CreateIcon());
+			Platform::SetApplicationIcon(Window::CreateIcon());
 		});
 	});
 }

Telegram/SourceFiles/platform/linux/specific_linux.cpp

@@ -52,6 +52,10 @@ bool IsApplicationActive() {
 	return static_cast<QApplication*>(QApplication::instance())->activeWindow() != nullptr;
 }
 
+void SetApplicationIcon(const QIcon &icon) {
+	qApp->setWindowIcon(icon);
+}
+
 QString CurrentExecutablePath(int argc, char *argv[]) {
 	constexpr auto kMaxPath = 1024;
 	char result[kMaxPath] = { 0 };

Telegram/SourceFiles/platform/mac/specific_mac_p.mm

@@ -33,6 +33,8 @@ std::optional<bool> ApplicationIsActive;
 
 } // namespace
 
+NSImage *qt_mac_create_nsimage(const QPixmap &pm);
+
 using Platform::Q2NSString;
 using Platform::NSlang;
 using Platform::NS2QString;
@@ -210,6 +212,17 @@ bool IsApplicationActive() {
 		: (static_cast<QApplication*>(QApplication::instance())->activeWindow() != nullptr);
 }
 
+void SetApplicationIcon(const QIcon &icon) {
+    NSImage *image = nil;
+    if (!icon.isNull()) {
+        auto pixmap = icon.pixmap(1024, 1024);
+		pixmap.setDevicePixelRatio(cRetinaFactor());
+        image = static_cast<NSImage*>(qt_mac_create_nsimage(pixmap));
+    }
+    [[NSApplication sharedApplication] setApplicationIconImage:image];
+    [image release];
+}
+
 void InitOnTopPanel(QWidget *panel) {
 	Expects(!panel->windowHandle());
 

Telegram/SourceFiles/platform/platform_specific.h

@@ -24,6 +24,7 @@ enum class PermissionType {
 
 void SetWatchingMediaKeys(bool watching);
 bool IsApplicationActive();
+void SetApplicationIcon(const QIcon &icon);
 bool TranslucentWindowsSupported(QPoint globalPosition);
 void StartTranslucentPaint(QPainter &p, QPaintEvent *e);
 void InitOnTopPanel(QWidget *panel);

Telegram/SourceFiles/platform/win/specific_win.cpp

@@ -336,6 +336,10 @@ bool IsApplicationActive() {
 	return static_cast<QApplication*>(QApplication::instance())->activeWindow() != nullptr;
 }
 
+void SetApplicationIcon(const QIcon &icon) {
+	qApp->setWindowIcon(icon);
+}
+
 QString CurrentExecutablePath(int argc, char *argv[]) {
 	WCHAR result[MAX_PATH + 1] = { 0 };
 	auto count = GetModuleFileName(nullptr, result, MAX_PATH + 1);

Telegram/SourceFiles/window/main_window.cpp

@@ -90,16 +90,11 @@ void ConvertIconToBlack(QImage &image) {
 }
 
 QIcon CreateOfficialIcon() {
-	auto useNoMarginLogo = (cPlatform() == dbipMac);
 	auto image = [&] {
 		if (const auto messenger = Messenger::InstancePointer()) {
-			return useNoMarginLogo
-				? messenger->logoNoMargin()
-				: messenger->logo();
+			return messenger->logo();
 		}
-		return useNoMarginLogo
-			? LoadLogoNoMargin()
-			: LoadLogo();
+		return LoadLogo();
 	}();
 	if (AuthSession::Exists() && Auth().supportMode()) {
 		ConvertIconToBlack(image);