Description: Downgrade Qt version
Author: Nicholas Guriev <guriev-ns@ya.ru>
Last-Update: 2017-03-31

diff --git a/Telegram/SourceFiles/main.cpp b/Telegram/SourceFiles/main.cpp
--- a/Telegram/SourceFiles/main.cpp
+++ b/Telegram/SourceFiles/main.cpp
@@ -23,9 +23,10 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "storage/localstorage.h"
 
 int main(int argc, char *argv[]) {
-#ifndef Q_OS_MAC // Retina display support is working fine, others are not.
+#if !defined(Q_OS_MAC) && QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
+	// Retina display support is working fine, others are not.
 	QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling, true);
-#endif // Q_OS_MAC
+#endif // not defined Q_OS_MAC and QT_VERSION >= 5.6.0
 	QCoreApplication::setApplicationName(qsl("TelegramDesktop"));
 
 	settingsParseArgs(argc, argv);
diff --git a/Telegram/SourceFiles/ui/text/text.cpp b/Telegram/SourceFiles/ui/text/text.cpp
--- a/Telegram/SourceFiles/ui/text/text.cpp
+++ b/Telegram/SourceFiles/ui/text/text.cpp
@@ -1692,11 +1692,11 @@ private:
 		if (item == -1)
 			return;
 
-#ifdef OS_MAC_OLD
+#if defined(OS_MAC_OLD) || QT_VERSION < QT_VERSION_CHECK(5, 6, 0)
 		auto end = _e->findItem(line.from + line.length - 1);
-#else // OS_MAC_OLD
+#else
 		auto end = _e->findItem(line.from + line.length - 1, item);
-#endif // OS_MAC_OLD
+#endif
 
 		int blockIndex = _lineStartBlock;
 		ITextBlock *currentBlock = _t->_blocks[blockIndex];
diff --git a/Telegram/SourceFiles/ui/twidget.cpp b/Telegram/SourceFiles/ui/twidget.cpp
--- a/Telegram/SourceFiles/ui/twidget.cpp
+++ b/Telegram/SourceFiles/ui/twidget.cpp
@@ -107,9 +107,9 @@ void sendSynteticMouseEvent(QWidget *widget, QEvent::Type type, Qt::MouseButton
 			, button
 			, QGuiApplication::mouseButtons() | button
 			, QGuiApplication::keyboardModifiers()
-#ifndef OS_MAC_OLD
+#if !defined(OS_MAC_OLD) && QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
 			, Qt::MouseEventSynthesizedByApplication
-#endif // OS_MAC_OLD
+#endif
 		);
 		ev.setTimestamp(getms());
 		QGuiApplication::sendEvent(windowHandle, &ev);