Fix build with Qt 6.10

Telegram/SourceFiles/data/data_document.cpp

@@ -1117,9 +1117,10 @@ void DocumentData::save(
 		if (!toFile.isEmpty()) {
 			if (!media->bytes().isEmpty()) {
 				QFile f(toFile);
-				f.open(QIODevice::WriteOnly);
-				f.write(media->bytes());
-				f.close();
+				if (f.open(QIODevice::WriteOnly)) {
+					f.write(media->bytes());
+					f.close();
+				}
 
 				setLocation(Core::FileLocation(toFile));
 				session().local().writeFileLocation(

Telegram/build/prepare/prepare.py

@@ -1654,7 +1654,7 @@ mac:
     make install
 """)
 else: # qt > '6'
-    branch = 'v$QT' + ('-lts-lgpl' if qt < '6.3' else '')
+    branch = 'v$QT' + ('-lts-lgpl' if qt.startswith('6.2.') else '')
     stage('qt_' + qt, """
     git clone -b """ + branch + """ https://github.com/qt/qt5.git qt_$QT
     cd qt_$QT